When a 3600-lb automobile runs out of gas, it is pushed by its unhappy driver and a friend a quarter of a mile (0.250 mi). To keep the car rolling, they must exert a constant force of 175 lb.
(a) How much work do they do?
(b) If it takes them 15.0 min, how much power do they develop?
(c) Expressed in horsepower, how much power do they develop?