Initial velocity Definition and 458 Threads

Homework Statement What was the initial velocity of an object that moved 120m in 5.60s, reaching a final velocity of 15.0m/s in that time? Homework Equations v=d/t a=v2-v1/t2-t1 3. The Attempt at a Solution I was wondering is there an acceleration that I'm missing here? or am i...

Homework Statement A baseball is hit at an angle theta. After a time, it lands 7.5m above the point at which it was hit, the land angle is 28 degree below the horizon. The final velocity is 36m/s2. Find the direction and magnitude of the initial velocity. Know: vf = 36m/s2...

Homework Statement A golf ball is hit at an angle of 30 degrees, it travels 50m landing straight in the hole. Ignoring air friction, what is the initial velocity? Homework Equations not too sure, d=vi.t+1/2.a.ts∧2, vf=u∧2+2.a.d, v=u+a.t, d=u.t The Attempt at a Solution Vertical...

Homework Statement A projectile must be fired from a cannon and hit the enemy headquarters located on the top of a cliff 75.0 m above and 350 m from the cannon. The cannon will shoot the projectile at an angle 40.0 degrees above the horizontal. What does the speed of the projectile need to...

Homework Statement 1) In which of the following situations is work done? A man rubs his hands together and they get warm or the moon orbits the earth? 2) A man pulls a 100 kg block across a frictionless floor using a rope. The rope makes an angle of 60 degrees with the horizontal and...

Homework Statement A carton is given an initial speed of 3.0 m/s up a 22.0 degree plane. a.) How far up the plane will it go? b.) How much time elapses before it returns to its starting point? Ignore friction. Homework Equations F=ma The Attempt at a Solution I have no clue. If...

Hello, When trying to find initial velocity in Proyectile motion can I use the formula or Range: R=Vo^2 x sin angle / Gravity The question is if the velocity I get through that equation will be the vector in X, Y or the resultant one? Thanks

Homework Statement A rock is thrown upwards at an angle of 35.0° to the horizontal. The rock hits a signpost 15.0 m away at a point 2.00 m above the level from which it was thrown. Calculate the initial velocity of the rock. Homework Equations d = v * t d= displacement...

Homework Statement With what initial velocity must an object be thrown upward (from ground level) to reach a maximum height of 550feet. Use a(t)= -32ft/sec2 as the acceleration due to gravity. (neglect air resistance) Homework Equations Use integration The Attempt at a Solution...

Homework Statement In order for a volleyball player to jump vertically upward a distance of 0.8 meters, his initial velocity must be?Homework Equations s=v0t + .5at2 vf= v0 + atThe Attempt at a Solution I missed the question the other day on a practice and it has been forever since I messed...

How could I find how long (time) it takes to reach terminal velocity with an initial velocity? http://www.geocities.com/operation_rising_star/mis.tve.htm <- does this make sense? using 1/2pV^2*C*A=ma Thanks in advance.

I'm in a physics 1 honors course at my high school and we have been working on projectile motion problems. I'm very confused on how to solve this problem though more because of the math than the physics I think. The problem asks for the initial velocity of a spear that was thrown at a 35...

This problem is quite difficult for me. I know that there's a way to do this, but i can't figure it out. Could someone point me in the right direction? i don't need a solution, but a process would be nice. Homework Statement A box is given an initial push so that it slides across the floor...

Homework Statement A gun fires a round that goes 122 km in 170 seconds before impacting the ground. Ignore air resistance and the curvature of the earth. Find the muzzle velocity and angle. Homework Equations Vx = Vi(cos(theta)) Yx = Vi(sin(theta)) t= (-2Vy/-9.8) and...

Homework Statement One way to measure the muzzle velocity of a bullet is to fire it horizontally inot a massive block of wood hanging from a string an d measure the height to which the wood (containing the bullet) rises. in one experiment the bullet had a mass of .05kg, and the wood has a...

Homework Statement A ball is thrown horizontally from the top of a building at 45.6 m/s. We want to know how long it takes for the ball to drop below an angle of 13 degrees. Ignore air resistance. Homework Equations I'm assuming the projectile equation is necessary (delta)y = Vyit +...

1. Homework Statement A Pole vaulter leaves the ground to travel 4.0 m up and over the bar, and then another 4.0 m back to the ground. It takes 1.81 s for the whole trip. Caculate the velocity with which she left the ground. 2. Homework Equations Well the equation I used which I saw...

Homework Statement two cars collide with each other and basically go different directions m1 starts out going West and m2 starts out going North I have set sign conventions to have North + and West - East + and south -...

Homework Statement I have a projectile that shoots straight up into the air (parallel to the y-axis). I need to calculate the initial velocity needed to reach a specific height. I am given the following: - the y-displacement (s1) to reach - the time (t) at which the projectile reaches the...

Homework Statement We are doing the Rocket lab in my Physics class, we shot rockets with different caps on them [ Low, Med, High ] and recorded the times. I have the time, i need to find Initial velocity and Height given that i have time. I also need to take into consideration air resistance [...

Homework Statement A rock is thrown from a 1 meter height with a 35 degrees angle with horizontal. At x=64 m, its height is y=29 m. Find it's initial velocity. Homework Equations x=x_{{0}}+v_{{{\it x0}}}t+ 0.5\,a_{{x}}{t}^{2} y=y_{{0}}+v_{{{\it y0}}}t+ 0.5\,a_{{y}}{t}^{2} The...

In simple kinematic problems, the initial velocity can be zero or some nonzero value. A friend asked me: what makes it zero in some cases and nonzero in some others. Take a rocket in take off. It has acceleration moving upward, from the beginning, but its v_0=0. Instead, if I apply...

I know if there was no initial velocity, the velocity at the bottom would just be sqrt(2gh), but I'm not sure how the initial velocity impacts the velocity at the bottom. I thought just adding the x-component of the velocity would be enough but apparently it's not :\

I'm really trying to get my head around this one and our text doesn't give a very good example of this. Problem: A nonrelativistic particle of charge q and mass m is in a uniform magnetic field B in the z drection. The inital position is x=0, y=0, z=0; the magnitude of inital velocity of...

I guess this isn't the proper format, but I would rather try and work out the complete problem on my own :\ If this is a huge faux pas then someone can go ahead and delete this post i suppose. Now that that's out of the way, could someone tell me if it is possible to determine acceleration...

Homework Statement We are doing a lab where the teacher took an chalkboard eraser and he put it between to rulers in a hallway. He used some sort of slingshot to project that eraser.( we did not see how far the eraser went) We have to find how far the eraser will travel in meters. All we were...

Homework Statement A 2.00-m tall basketball player is standing on the floor 10.0 m from the basket. If he shoots the ball at a 40 degree angle from the horizontal, at what initial speed must he throw the ball so that it goes through the basket without striking the backboard? The height of the...

Hi guys, I'm having trouble finding a reasonable answer to the initial velocity of a car. These are my givens: t(s) 0 1.0 2.0 3.0 4.0 5.0 x(m)0 2.3 9.2 20.7 36.8 57.5 I have solved that the average velocity = 13.8m/s That the average acceleration =...

Homework Statement A salmon starts 2.00 m from a waterfall that is 0.55 m tall and jumps at an angle of 32.0. What must be the salmon's minimum initial speed to reach the waterfall. Homework Equations \Deltay=visin\Theta\Deltat+1/2g\Deltat2 The Attempt at a Solution I have tried all...

Homework Statement A salmon starts 2.00 m from a waterfall that is 0.55 m tall and jumps at an angle of 32.0. What must be the salmon's minimum initial speed to reach the waterfall. Homework Equations \Deltay=visin\Theta\Deltat+1/2g\Deltat2 The Attempt at a Solution I have tried all...

Homework Statement A stone is thrown down a slope. I am given the Range of the slope and the max height from spot thrown. R= 50m h= 12m Homework Equations I need to determine the magnitude of Vo and inital theta. The Attempt at a Solution First I need to find V_o: I feel that the only...

I am given the information that a nerf dart is launched upwards at a 90 degrees with the top of the launcher at 1.953ft and that it hits the ground .43 seconds later. I am then tasked with finding the initial velocity of the launcher and I have no idea where to start.

Does it's initial velocity effect the acceleration a mass receives due to the gravitational field? If two bodies of equal mass were moving towards a massive body, and they started at the same radius from the surface but one went at 10 times the velocity of the other, when the bodies impact...

Hello, I want to know how long time a running runner needs to reach a point, when he is initially running in the wrong direction. I'd like to do this with minimal calculation, so an approximation at 10% would be enough. To even complicate the problem more, the runner can decelerate...

Homework Statement Two rolling gold balls of the same mass collide. The velocity of one ball is initially 2.70 m/s [E]. After the collision, the velocities of the balls are 2.49 m/s [62.8 degrees N of W] and 2.37 m/s [69.2 degrees S of E]. What are the magnitude and direction of the unknown...

Collisions and Determining the Original Speed Homework Statement Two spacecraft s from different nations have linked in space and are coasting with their engines off, heading directly toward Mars. The spacecraft s are thrust apart by the use of large springs. Spacecraft 1, of mass 1.9 x...

I am looking for a simple equation to calculate my initial velocity when I jump in layman's terms. For instance...if I weigh 91kg and jump 1 meter...what is my initial velocity and what would my maximum jump height be if I weighed 81kg? This is probably something I missed in freshman...

Homework Statement home run hit and baseball just clears the top of the bleachers. @= 35 degrees bleacher height = 21 meters distance from bleachers to home plate = 130 meters neglect air resistance find initial velocity and time of flight Homework Equations x comp: x= vcos@ t +...

[SOLVED] Initial velocity not given Hello, I was looking for a strategy for finding the initial velocity for a problem that gives the angle and height. The problem is: A ball is dropped and rebounds with an intial velocity of what magnitude considering the ball must bounce through an...

im working on a lab and i have to determine the initial velocity of gliders that we pushed down an airtrack. the only data that was recorded is the change in x and time. eg. change in x = .3 meters t= 1.1 seconds i've looked through all the equations i could think of to find the answer...

Homework Statement how can you find the initial velocity if the angle, horizontal distance and the vertical distance is given?Homework Equations The Attempt at a Solution every equation i use gives me a different answer so i have no clue which one is correct

is it possible to find the initial velocity of a projectile if you only know the Force applied (47N) to the projectile and the mass (0.04kg) of the projectile (assuming air resistance is negligible).. oh and the angle it was fired at was 30 degrees.. thanks in advance

Hello all, This is my first post so be gentle. :smile: I am programming a ballistics related script to a predefined physics engine. I am no physicist nor a mathematician so my knowledge in these things is quite limited. To the point: I need to calculate the initial velocity needed to...

After a completely inelastic collision between two objects of equal mass, each hacing initial speed v, the two move off together with speed v/3. What was the angle between their initial directions?

Homework Statement If at height of 40 m the direction of motion of a projectile makes an angle 45 degrees with the horizontal, then what is its initial velocity and angle of projection? Homework Equations The Attempt at a Solution

A 2020kg car moving at 20.0m/s collides and locks together with a 1400kg car at rest at a stop sign. Show that momentum is conserved in a reference frame moving at 10.0m/s in the direction of the moving car. initial momentum final momentum I don't understand why that the answer for...

What equation do I use to find the initial velocity of an object?

How do I get a formula that finds the initial velocity with height in it?? How do I get a formula that finds the initial velocity with height in it?? i was doing a inclined plane problem with is deal with 2 steel balls' collision~ could somebody help me to derivate that formula?

thanks

Homework Statement At half its maximum height, the speed of a projectile is three-fourth its initial speed. What is the angle of the initial velocity vector with respect to the horizontal Homework Equations any projectile equation The Attempt at a Solution ?