Calculating Time in Air for a Vertically Launched Rocket

In summary, kinematics is the study of motion without considering the forces causing it. A kinematic relationship is a mathematical equation describing the relationship between kinematic quantities. Speed and velocity are different in that speed is a scalar quantity while velocity is a vector quantity. Acceleration is the change in velocity over time and can be positive or negative. Displacement and distance are related in that displacement is a vector quantity measuring change in position while distance is a scalar quantity measuring total path length. However, displacement takes into account direction while distance does not.
  • #1
kingyof2thejring
82
0
Question 3
A toy rocket is fired vertically upwards with an initial velocity of 29.2 ms-1. Calculate how long (in s) the rocket stays in the air before it returns to the ground.
s=?
u=29.2
v=0
a=-g
t=?
i've used t=(v-u)/a and then multiplied the answer by 2
is this the correct method to calculate the answer.
thanks in advance
 
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  • #2
Looks good to me.
 
  • #3
v is 0 at the apex.

Edit: Sorry, I see you multiplied by 2.
 
Last edited:
  • #4
cheers!
 

FAQ: Calculating Time in Air for a Vertically Launched Rocket

What is kinematics?

Kinematics is the branch of physics that studies the motion of objects without considering the forces that cause the motion.

What is a kinematic relationship?

A kinematic relationship is a mathematical equation or formula that describes the relationship between different kinematic quantities, such as position, velocity, and acceleration.

What is the difference between speed and velocity?

Speed is a scalar quantity that measures how fast an object is moving, while velocity is a vector quantity that measures both the speed and direction of an object's motion.

What is acceleration?

Acceleration is the rate of change of an object's velocity over time. It can be positive (speeding up) or negative (slowing down) depending on the direction of the change.

How are displacement and distance related?

Displacement is a vector quantity that measures the change in an object's position from its initial position to its final position. Distance, on the other hand, is a scalar quantity that measures the total length of the path traveled by an object. While displacement takes into account the direction of motion, distance does not.

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