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AP® Physics C: Mechanics

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Momentum and Collisions: Elastic Collision Truths

APPHMC-KD3FHG

Object 1, with an initial speed of $v_{1i} $ moves towards an identical, stationary Object 2. Eventually, Object 1 collides with Object 2. After the collision, the speeds of the two objects will be $v_{1f}$ and $v_{2f}$, respectively.

If the collision is elastic, which of the following MUST be true?

A

$v_{1f}=v_{2f}$

B

$v_{1f}=-v_{1i}$

C

$v_{2f}=0$

D

$v_{1f}=0$

E

$v_{1f}=\cfrac{v_{1i}}{2}$