2. A 20kg mass is held 4m above the ground. What is the approximate potential evergy of the mass with respect to the ground?
A. 5J.
B. 50J
C 80J
D. 800J

3. A car moves 4 times as fast as another identical car. Compared to the slower car, the faster car has.........times the KE.
A.2
B. 4
C. 8
D. 16

4. Car A travels four times as fast as Car B. When braking to a stop, Car A skids................times as far as Car B.
A. 0.25
B. 0.5
C. 4
D. 16

5. No work is done by gravity on a bowling ball that is rolled along a bowling alley because.........
A. No distance is covered by the ball
B. No force acts on the ball
C. No potential energy is being converted to kinetic energy
D. The for on the ball is at right angles to the ball's motion.