A block initially at rest on a smooth horizontal surface is acted upon by a force…

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

Problem

1\,\text{kg}

block initially at rest on a smooth horizontal surface is acted upon by a force that varies with displacement according to

F = 4x\,\text{N}

, where

x

is in metres measured from the starting point. The speed of the block after it has moved

2\,\text{m}

is (a)

5.7\,\text{m s}^{-1}

(b)

4\,\text{m s}^{-1}

(c)

2.8\,\text{m s}^{-1}

(d)

6.9\,\text{m s}^{-1}