# ps08sol - MASSACHUSETTS INSTITUTE OF TECHNOLOGY Department...

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MASSACHUSETTS INSTITUTE OF TECHNOLOGY Department of Physics Physics 8.01T Fall Term 2004 Problem Set 8: Center of Mass, Momentum and Impulse: Solutions Problem 1: Pre-Experiment 07 Concept Questions a) Cart A is at rest on a straight horizontal track with negligible friction. An identical cart B, moving to the right, collides with cart A. They stick together. After the collision, which of the following is true? 1. Carts A and B are both at rest. 2. Carts A and B move to the right with a speed greater than cart B's original speed. 3. Carts A and B move to the right with a speed less than cart B's original speed. 4. Cart B stops and cart A moves to the right with speed equal to the original speed of cart B. Explain your reasoning. b) Cart A is at rest on a straight horizontal track with negligible friction. An identical cart B, moving to the right, collides elastically with cart A. They do not stick together. After the collision, which of the following is true?

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