Posted by **Tomtom** on Sunday, December 13, 2009 at 11:51am.

1. A 1000kg car moving at 10m/s brakes to a stop in 5s. The average braking force is...........N?

A. 1000

B. 2000

C. 4000

D. 5000

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 TV set is pushed a distance of 2m with a force of 20 N that is in the same direcion as the set moves. How mauch work is done on the set?

A. 10J

B. 20J

C. 40J

D. 80J

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