A Man Pushes an 80-N Crate a Distance of 5

Multiple Choice

A man pushes an 80-N crate a distance of 5.0 m upward along a frictionless slope that makes an angle of 30°with the horizontal.His force is parallel to the slope.If the speed of the crate decreases at a rate of 1.5 m/s², then the work done by the man is:

A) -200 J
B) 61 J
C) 140 J
D) 200 J
E) 400 J