Physics

Problem

A car moves along a straight road. Its velocity decreases uniformly from

18\,\text{m/s}

6\,\text{m/s}

4\,\text{s}

. Which statement correctly describes its acceleration during this interval? a) Positive acceleration of

3\,\text{m/s}^2

b) Negative acceleration of

3\,\text{m/s}^2

c) Zero acceleration d) Negative acceleration of

6\,\text{m/s}^2