A force given by N acts on a block along a straight line for

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

Problem

A force given by

F(t)=3t

N acts on a

2\,\text{kg}

block along a straight line for

0\le t\le 2\,\text{s}

. The block is already moving in the same direction with an initial speed of

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

. Find its speed at

t=2\,\text{s}

. (a)

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

(b)

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

(c)

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

(d)

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