A girl and her bicycle have a total mass of 40 kg. At the top of the hill her speed is 5.0 m/s. The hill is 10 m high and 100 m long. If the force of friction as she rides down the hill is 20 N, what

A. 5.0 m/s

B. 10 m/s

C. 11 m/s

D. She stops before she reaches the bottom

E. 16 m/s

F. 19 m/s