1. The mass of a penny is 2.50 g. What is the gravitational potential energy of the penny if it at rest at the top of the Empire State Building which is 381 m high.

2. A sky diver is about to jump out of a plane 2500 m high. She has a mass of 58 kg. What is her gravitational potential energy? (Ignore all kinetic energy)

3. A tired mom is picking up after her child and she bends down to pick up his Yoshi doll. The plush doll has a mass of 0.45 kg. She lifts if from the floor to about her waist 1.0 m high. What is the work done by the mom to pick up the doll?

4. A 8.5 kg suit case is on the top of a shelf that is 2.4 m high. What is the work required by a guy to place it on the bed 0.90 m high?

5. A mechanic has a car on a lift. The 2050kg car goes up from the ground to a point 2.45 m high. What is the work done by gravity to lift the car?

6. A kid is on a sled sliding down a hill. The hill is 8.0 m high and slopes slowly downwards. The kid and sled together have a mass of 51 kg. How much work does gravity do in bringing the kid down?