Can you please help me answer number 9?

9. (161) A cart of coal weighing 320 pounds is rolling down a ramp 22 feet long in a mine, at an incline of 16. (The force applied by gravity is equal to the weight of the cart and the coal.) Find the work done by gravity as the cart moves the length of the ramp. Assume that friction is not a factor. The answer should be rounded to one decimal place. A. 1,940.5 foot-pounds B. 2,000.0 foot-pounds C. 1,520.5 foot-pounds D. 1,440.8 foot-pounds 22 feet E. 7,040.0 foot-pounds 16 .. |IF |1 =320 lbs