Starting from Rest at T = 0, a 5

Multiple Choice

Starting from rest at t = 0, a 5.0-kg block is pulled across a horizontal surface by a constant horizontal force having a magnitude of 12 N. If the coefficient of friction between the block and the surface is 0.20, at what rate is the 12-N force doing work at t = 5.0 s?

A) 0.13 kW
B) 0.14 kW
C) 0.12 kW
D) 26 W
E) 12 W