What is the Acceleration of a Tennis Ball After Being Served?

[LCB]

When a 58 g tennis ball is served, it accelerates from rest to a constant speed of 49 m/s. The impact with the racket gives the ball a constant acceleration over a distance of 45 cm. What is the magnitude of the net force acting on the ball?

I tried using Fnet=ma, but acceleration isn't given. So I tried to find acceleration by dividing the velocity by time, but time isn't given. Then I tried to use a kinematic formula without time in it to solve for acceleration. When I got my "answer", it wasn't right. What in the world am I doing wrong?

 

[StatusX]

How much work has the force done on the ball?

 

[HallsofIvy]

For any acceleration, starting from rest, v= at and s= (1/2)at².

Here you are told that v= 49 m/s and s= 45 m/s². You can solve those two equations for a and t. (Of course, you only need a.)