Car A rear ends Car B, which has twice 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. each car has half the momentum.
B. car A stops and car B has momentum mv.
C. car A stops and car B has momentum 2mv.
D. the momentum of car B is four times as great in magnitude as that of car A.
E. each car has half of the kinetic energy.
Answer: D
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