Physics

Problem

A hockey puck slides eastward at

6\,\text{m/s}

. After

3\,\text{s}

, it is moving westward at

4\,\text{m/s}

(take east as the positive direction). Determine its acceleration. a)

+0.67\,\text{m/s}^2

(eastward) b)

+3.3\,\text{m/s}^2

(eastward) c)

-3.3\,\text{m/s}^2

(westward) d)

-0.67\,\text{m/s}^2

(westward)