An 80-N Crate Slides with Constant Speed a Distance of 5.0

Multiple Choice

An 80-N crate slides with constant speed a distance of 5.0 m downward along a rough slope that makes an angle of 30° with the horizontal.The work done by the force of gravity is:

A) -400 J
B) -200 J
C) -69 J
D) 200 J
E) 400 J