A factory worker pushes a 30.2kg crate a distance of 4.5m along a level floor at constant velocity by pushing downward at an angle of 29 below the horizontal. The coefficient of kinetic friction between the crate and floor is 0.25.
a-What magnitude of force must the worker apply to move the crate at constant velocity?
b-How much work is done on the crate by this force when the crate is pushed a distance of 4.5 m?
c-How much work is done on the crate by friction during this displacement?
d-How much work is done by the normal force?
e-How much work is done by gravity?
f-What is the total work done on the crate?