posted by Tomtom .
1. A 1000kg car moving at 10m/s brakes to a stop in 5s. The average braking force is...........N?
2. A 20kg mass is held 4m above the ground. What is the approximate potential evergy of the mass with respect to the ground?
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?