Answer
a) 0 $m/s^{2}$
b) -14 $m/s^{2}$
Work Step by Step
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 $m/s^{2}$
