Question 1: Which of the following is conserved in a 2-D collision? Indicate all correct answers:
Answer: a,b: momentum in each direction
Question 2: Define "inelastic collision".
Answer: Any collision in which kinetic energy is not conserved. KE is often lost as objects deform or break during a collision.
Question 3: If there are no unbalanced external forces during a collision, then the center of mass of all he colliding objects must
Answer: b: move with a constant velocity
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