A 16-Kg Block Slides Down a Plane (Inclined at 25 $\degree$

Multiple Choice

A 1.6-kg block slides down a plane (inclined at 25 $\degree$ with the horizontal) at a constant speed of 2.0 m/s.At what rate is the frictional force changing the mechanical energy of the block?

A) +28 W
B) +13 W
C) -13 W
D) -28 W
E) +6.5 W