## Physics (10th Edition)

a) 0 $m/s^{2}$ b) -14 $m/s^{2}$
a) $acceleration$ = $\frac{v-u}{t}$ = $\frac{82-82}{t}$ = $\frac{0}{t}$ = 0 $m/s^{2}$ Travelling at a constant velocity (no change in velocity) hence acceleration is 0 b) $acceleration$ = $\frac{v-u}{t}$ = $\frac{-82-82}{12}$ = $\frac{-164}{12}$ $\approx$ -14 $m/s^{2}$