SAT Subject Physics Practice Question 295: Answer and Explanation

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Question: 295

66.

An object of mass 2m moving with velocity U strikes an object of mass m initially at rest. After the collision, the objects move away with velocities u and v, as shown.

If the collision is elastic, then

A. U2 = u2v2
B. U2 = u2 + v2
C. U = uv
D. U = u + v
E. (Uu)2 = v2

Correct Answer: B

Explanation:

If the collision is elastic, then kinetic energy is conserved. Therefore

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