Together, two students exert a force of 640 N in pushing a car a distance of 30 m.
(a) How much work do the students do on the car?
J
(b) If the force was doubled, how much work would they do pushing the car the same distance?
J
(c) An electric motor develops 57 kW of power as it lifts a loaded elevator 16.5 m in 35 s. How much force does the motor exert?
N