A roller coaster car of mass 1000 kg is sitting on the first hill of a roller coaster ride as shown below.
H = 100 m
H = 40 m
a. Draw the free-body diagram roller coaster car sitting on the first hill on the dot below.
b. If the speed of the car on the second hill is 38 m/s (at h=40 m), how much energy was lost due to friction?