A. When a 50.0 kg skier (initially at rest) skis down a ramp located on Mars (where the acceleration due to gravity is 3.711 m/s2) from a vertical height of 2.00 m, she attains a speed of 3.00 m/s.

- a) What is the skier's total mechanical energy at the top of the ramp?

- b) What is the skier's total mechanical energy at the bottom of the ramp?

- c) ) What is the percent efficiency of the ramp?

B. What is the cost of operating a 100 W light bulb 4 hours a day for 6 days if the price of electrical energy is 5 c/kWh?

C. How much power does Daniel produce if he transforms 2.4 kJ of chemical energy (in pizza that he ate that day) into kinetic energy and thermal energy in 12.5 s