### What is the friction force that acts on the bear

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Q1. Assume a 6.0 g bullet travelling at 100 m/s strikes a bulletproof vest and comes to rest in about 600 microseconds. What average force would it impart to the happy wearer?

Q2. A 355 kg bear grasping a vertical tree slides down at constant velocity. What is the friction force that acts on the bear?

Q3. A small, 300 g cart is moving at 1.60 m/s on an air track when it collides with a larger, 1.00 kg cart at rest. After the collision, the small cart recoils at 0.890 m/s.

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