Question: 1. Describe a perfectly inelastic collision as viewed in the center-of-mass reference frame. 2. Why can friction and the force of gravity usually be neglected

1. Describe a perfectly inelastic collision as viewed in the center-of-mass reference frame.

2. Why can friction and the force of gravity usually be neglected in collision problems?

3. As a pendulum bob swings back and forth, is the momentum of the bob conserved? Explain why or why not.


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