Car A rear-ends Car B, which has triple the mass of A, on an icy road at a speed

Question

Car A rear-ends Car B, which has triple the mass of A, on an icy road at a speed low enough so that the collision is essentially elastic. Car B is stopped at a light when it is struck. Car A has mass m and speed v before the collision. After the collision: (a) the momentum of car B is three times as great in magnitude as that of car A. (b) car A stops and car B has momentum 3mv. (c) each car has half the momentum. (d) car A stops and car B has a momentum mv. (e) each car has half of the kinetic energy.

Explanation / Answer

ans is C

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