Physics (10th Edition)

Published by Wiley
ISBN 10: 1118486897
ISBN 13: 978-1-11848-689-4

Chapter 7 - Impulse and Momentum - Check Your Understanding - Page 186: 15


d) is correct.

Work Step by Step

There is no external force, so the momentum is conserved. Therefore, the total momentum before the collision and after the collision has to be the same: $$p_{01}+p_{02}=p_{f1}+p_{f2}$$ So a) and c) are eliminated. Because the collision is elastic, kinetic energies are conserved, too. $$\sum KE_0=\sum KE_f$$ Therefore, d) is correct.
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