Answer
$-8.9 \frac{m}{s^{2}}$.
Work Step by Step
Find the time using equation 2-2.
$$averagevelocity=\frac{displacement}{time}{}$$
$$28 \frac{m}s=\frac{0m - 88 m}{time}= 3.14 {s}{}$$
Find the acceleration from equation 2–11c.
$$a=\frac{0-(28 m/s)^2}{3.14 s}= -8.9 \frac{m}{s^{2}}$$
