Physics

Problem

A car moves along a straight road such that its velocity is

+12\,\text{m\,s}^{-1}

for

8\,\text{s}

and then

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

for the next

5\,\text{s}

. Taking the starting point as origin and east as the positive direction, find: a. (i) the displacement of the car at the end of

13\,\text{s}

, b. (ii) the average velocity for the whole

13\,\text{s}

interval.