A 21.0-kg shopping cart is moving with a velocity of 4.0 m/s. It strikes a 11.0-

Question

A 21.0-kg shopping cart is moving with a velocity of 4.0 m/s. It strikes a 11.0-kg box that is initially at rest. They stick together and continue moving at a new velocity. Assume that friction is negligible. What was the momentum of the shopping cart before the collision? 168 kg dot m/s 84.0 kg dot m/s 44.0 kg dot m/s 0 kg dot m/s What was the momentum of the box before the collision? 84.0 kg dot m/s 0 kg dot m/s 168 kg dot m/s 44.0 kg dot m/s What is the velocity of the combined shopping cart/box wreckage after the collision? 4.0 m/s 7.64 m/s 2.6 m/s 0 m/s

Explanation / Answer

1.   momenmtun = mv = 21*4 =   84 kgm/s

2. 0

3. V = 21*4/(21+11) = 2.6 m/s

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