Question

A. No work is done by gravity on a bowling ball that rolls along a bowling alley because

1.  No force acts on the ball.
2.  The force on the ball is at right angles to the ball's motion.
3.  The ball's speed remains constant
4.  Little distance is covered by the ball.

B.  A melon is tossed straight upward with 100 J of kinetic energy. If air resistance is negligible the melon will return to its initial level with a kinetic energy of

1. less than 100 J.
2. more than 100 J.
3. 100 J.

C. Suzie Skydiver, who weighs 500 N, reaches a terminal velocity of 90 km/h. The air resistance on Suzie is then

1. 500 N.
2. 90 N.
3. 250 N.
4. 410 N.
5. none of the above