An Object of Mass 4 Kg Starts at Rest from the Top

Multiple Choice

An object of mass 4 kg starts at rest from the top of a rough inclined plane of height 10 m as shown in Fig. 8-9. If the speed of the object at the bottom of the inclined plane is 10 m/s, how much work is done by the force of friction? Use g = 10 m/s².

A) -100 J
B) 100 J
C) 0
D) -200 J
E) 200 J