1. Two identical billiard balls traveling at the same speed have a head-on collision and rebound. If the balls had twice the mass, but maintained the same size and speed, how would the rebound be different?
(a) At a higher speed.
(b) At slower speed.
(c) No difference.
2. An astronaut is a short distance away from her space station without a tether rope. She has a large wrench. What should she do with the wrench to move toward the space station?
(a) Throw it directly away from the space station.
(b) Throw it directly toward the space station.
(c) Throw it toward the station without letting go of it.
(d) Throw it parallel to the direction of the station's orbit.
(e) Throw it opposite to the direction of the station's orbit.