A factory worker pushes a 28.4 kg crate a distance of 4.9 m along a level floor at constant velocity by pushing downward at an angle of 32degrees below the horizontal. The coefficient of kinetic friction between the crate and floor is 0.26.
How much work is done on the crate by friction during this displacement?
How much work is done on the crate by this force when the crate is pushed a distance of 4.9?