(g = 9.8Nkg-1)

1. Calculate the potential energy gained by a 10kg mass when it is raised to a height of 10m.

2. A football of mass 600g is kicked 12m up into the air. How much potential energy does it gain?

3. A diver of mass 60kg dives from a platform 5m up. Find how much potential energy she loses.

4. A man of mass 80kg uses a lift to go from the second floor of a building (6m above ground level), up to the eighth floor (24m above ground level). Calculate the change in potential energy.

5. An astronaut on the Moon throws a stone of mass 2kg to a height of 25m. If the gravitational field strength on the Moon is 1.6Nkg-1, find the potential energy gained.

6. A dog of mass 20kg gains 784J of potential energy by climbing up a flight of stairs. Calculate the height of the stairs.

7. A rock of mass 4kg falls from the top of a cliff and loses 4.9kJ of potential energy. How high is the cliff?

8. During the high jump event in the school sports a girl just clears the bar at a height of 1.25m. If she has 490J of potential energy at this height, what is her mass?

9. A pencil rolls off a desk 80cm high and has lost 196mJ of potential energy by the time it reaches the floor. Find the mass of the pencil.

10. An alien on the surface of Jupiter has a mass of 200kg. If it gains 5.2MJ of potential energy by rising to a height of 1km above the surface, calculate the gravitational field strength on Jupiter.