**Chapter 15 Energy Problems**

Directions: Complete the questions using formulas from Chapter 15.

1. A 70-kilogram man is walking at a speed of 2.0 m/s. What is his kinetic energy?

2. A 1400-kilogram car is moving at a speed of 25 m/s. How much kinetic energy does the car have?

3. A 50 kg cheetah has a kinetic energy of 18,000 J. How fast is the Cheetah running? (hint: rearrange the equation to solve for v.)

4. A diver at the top of a 10 m high diving platform has a mass of 50 kg. Calculate her potential energy.

5. A pitcher throws a .145 kg baseball at a velocity of 30. m/s. How much kinetic energy does the ball have?

6. A small meteoroid is approaching Earth. It has a mass of 100 kg and a speed of 10 km/s. How much kinetic energy does the meteoroid have?

7. A 50.0 kg wolf is running at 10 m/sec. What is the wolf’s kinetic energy?

8. A 50 kg man is standing on a waterfall that is 100 meters high? What is his potential energy?

9. A 5 kg bird is standing on a tree branch that is 25 meters high? What is the bird’s potential energy?

10. A 10 kg monkey sits atop his perch at 5 meters. What is the monkey’s potential energy?

11. What is the kinetic energy of a football (2.5 kg) thrown 60 m/s?

12. The total potential energy of man atop a building is 2500 J. The building is 100m tall. What is the man’s mass?

13. The total potential energy of a dolphin (25kg) is 1000 J when it jumps out of the water. How high does the dolphin jump above the water?

14. The total kinetic energy of a linebacker is 2500J. The linebacker weighs 100 kg. How fast is the linebacker running?

15. The total kinetic energy of the running back is 2000J. He is running 3 m/s. How much does the running back weigh?