A block starts from rest on a frictionless horizontal surface and moves under a…

PHYSICS · Single correct · A Level · Physics · Mechanics and materials · Mechanics and materials

Problem

2\,\text{kg}

block starts from rest on a frictionless horizontal surface and moves under a constant force that produces an acceleration of

3\,\text{m s}^{-2}

. Calculate the instantaneous power delivered to the block after

4\,\text{s}

. (a)

36\,\text{W}

(b)

96\,\text{W}

(c)

72\,\text{W}

(d)

144\,\text{W}