A block starts from rest on a smooth horizontal track

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

Problem

1\,\text{kg}

block starts from rest on a smooth horizontal track. A constant horizontal force of

6\,\text{N}

acts on it over a distance of

3\,\text{m}

, after which the force is removed. The block then enters a rough horizontal section where a kinetic frictional force of

2\,\text{N}

acts on it. How much distance will the block travel on the rough section before coming to rest? (a)

4.5\,\text{m}

(b)

9\,\text{m}

(c)

18\,\text{m}

(d)

6\,\text{m}