A factory worker pushes a 30.O-kg crate a distance of 4.5 m along a level floor at constant velocity by pushing horizontally on it. The coefficient of kinetic friction between the crate and the floor is 0.25.
(a) What IIlll8nitude of force must the worker apply?
(b) How much work is done on the crate by this force?
(c) How much work is done on the crate by friction?
(d) How much work is done on the crate by the normal force By gravity?
(e) What is the total work done on the crate?