Projectile Range Symmetry Proof

In summary, to prove that a projectile launched at angle @ has the same horizontal range as one launched with the same speed at angle (90 - @), kinematics can be used. By decomposing the initial speed into its vertical and horizontal components, V_y=Vsin@ and V_x=Vcos@, the time in air and range of the projectile can be calculated. Additionally, it is important to note that sin(90-@) = cos(@) in this scenario.
  • #1
peasant242
2
0

Homework Statement



Prove that a projectile launched at angle @ has the same horizontal range as one launched with the same speed at angle (90 - @).

Homework Equations



Obviously kinematics will be used =/

The Attempt at a Solution



I've been messing around with kinematics but haven't gotten anywhere. I also know that sin(90-@) = cos(@) . Help appreciated :]
 
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  • #2
let the initial speed be V, and decomposite into V_y=Vsin@ and V_x=Vcos@. Now use this to first calculate the time the projectile is in the air and then the range of the projectile.
 
  • #3
I appreciate the help but when you decomposite the V wouldn't it be:

V_y = sin(90-@)
V_x = cos(@)
 
  • #4
uhm no, you said yourself that sin(90-@)=cos@, so that would give V_y=V_x :)
 

FAQ: Projectile Range Symmetry Proof

What is the formula for calculating the range of a projectile?

The formula for calculating the range of a projectile is R = (v2sin2θ)/g, where R is the range, v is the initial velocity, θ is the angle of launch, and g is the acceleration due to gravity (9.8 m/s2).

How does air resistance affect the range of a projectile?

Air resistance can decrease the range of a projectile by slowing it down as it travels through the air. This is because air resistance acts in the direction opposite to the projectile's motion, reducing its velocity and therefore its range.

What is the maximum range of a projectile?

The maximum range of a projectile occurs when it is launched at a 45-degree angle. In this scenario, the horizontal and vertical components of the initial velocity are equal, resulting in the maximum range possible for a given initial velocity and acceleration due to gravity.

How does the initial velocity affect the range of a projectile?

The initial velocity has a direct effect on the range of a projectile. The higher the initial velocity, the greater the range will be. This is because a higher initial velocity results in a greater horizontal component of the velocity, allowing the projectile to travel further before hitting the ground.

Can the range of a projectile be affected by the angle of launch?

Yes, the angle of launch can greatly impact the range of a projectile. Launching a projectile at a lower angle will result in a shorter range, while launching it at a higher angle will result in a longer range. This is because the initial velocity will have a greater vertical component at a higher angle, resulting in a higher peak height and longer travel time before hitting the ground.

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