Question

A 50 kg box slides on a flat surface, initially sliding at 50 m/s. It has...

A 50 kg box slides on a flat surface, initially sliding at 50 m/s.

It has a smaller, 10 kg box on top,initially moving at the same velocity as the box.

The coefficient of kinetic friction is 0.5 for the largebox against the ground, and 0.4 for the smaller box against the larger box.

a) Both boxes start to slow from friction, but the larger box experiences a larger deceleration than the small one. This means the smaller box will slide on the surface of the larger one. How long does it take for the large box to stop?

b) How much longer does it take for the small box to stop? Assume the bottom box is large enough for the small one to never to slide off its side.

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