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

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

Problem

5\,\text{kg}

block starts from rest and moves on a smooth horizontal surface under a constant horizontal force such that its acceleration is

2\,\text{m/s}^2

. Calculate the instantaneous power of this force when the block has travelled

9\,\text{m}

from the start point. (a)

30\,\text{W}

(b)

120\,\text{W}

(c)

60\,\text{W}

(d)

90\,\text{W}