1. What happens to the velocities of two identical masses colliding exactly elastically when they are moving in opposing directions? a. Exchange b. Unchanged c. Increase d. Decrease

2.A ball that is moving at some speed v collides elastically with a stationary ball. How will the system fare? a. The traveling ball will come to rest, and the stationary ball will begin to move with a velocity of v. b. The moving ball begins to move in the opposite direction while the stationary ball stays at rest. c. The two balls stop moving. d. Both balls begin to move.

3. For what value of e is a collision partially elastic? a. 0 d. 0

4. When is momentum is conserved? a. in an elastic collision of two balls b. in an inelastic collision of two balls c. in the absence of an external force d. all of the preceding cases

5. What is the reading in the vernier caliper? a. 3.63 b. 3.64 c. 3.65 d. 3.66

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