Use the formulas for energy to solve the following problems. Remember to identify each given quantity, consider what the question is asking, and then decide on the appropriate formula. Show your work. Always check for conversions and answer with the correct sig figs and units.

1. How much energy does a 1250 kg car have if it is traveling at 25.0 m/s?

2. What is the gravitational energy of a 4.8 kg bowling ball that is atop a 25.0 m cliff?

3. How much less potential energy does the bowling ball in #2 have if it isloweredto 15.0 m? How much kinetic energy has it gained?

4. What is the kinetic energy lost when a bullet, mass10.0 g, penetrates into a piece of wood after it had been traveling at a speed of320 km/hr?

5. Explain how the law of conservation of energy applies to the frog popper that you used at the beginning of the period.