A block slides on a frictionless track with a velocity of directed east

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

Problem

2\,\text{kg}

block slides on a frictionless track with a velocity of

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

directed east. A constant horizontal force of

3\,\text{N}

, also directed east, acts on the block for

4\,\text{s}

. What is the block’s speed at the end of the

4\,\text{s}

? (a)

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

(b)

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

(c)

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

(d)

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