1)How fast is her racket moving immediately after the impact? You can ignore the interaction of the racket with her hand for the brief duration of the collision.

2)If the tennis ball and racket are in contact for 9.00 ms, what is the average force that the racket exerts on the ball?

is this a momentum problem where i figure out the p_initial and then p_final and subtract final from initial? and then solve for velocity after from the p_final? and im not sure for the second question. thanks in advance for your help.