Question

he diagram shows the initial velocity and the final velocity of a ball hit by

a racquet. The ball is in contact with the racquet for a time of 0.25 s.

Calculate: a the change in the velocity of the ball.b the average acceleration of the ball.

Answer 1

Suppose that $v_1=10\ (m/s)$ and $v_2=17 \ (m/s)$ .

a. $\Delta v =v_2-v_1=-17-10=-27\ (m/s)$

b. $a=\Delta v/\Delta t=-27/0.25=-108\ (m/s^2)$