Answer
(a) The racquet exerted an average force of 139 N on the ball.
(b) please refer to the free-body diagram
Work Step by Step
(a) We can find the ball's acceleration.
$a = \frac{v-v_0}{t} = \frac{(73.14~m/s)-0}{0.0300~s}$
$a = 2438~m/s^2$
We can use a force equation to find the force.
$F = ma = (0.057~kg)(2438~m/s^2)$
$F = 139~N$
The racquet exerted an average force of 139 N on the ball.
(b) please refer to the free-body diagram
