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A 53.0 g tennis ball with an initial speed of 30.5 m/s hits a wall and rebounds with the same speed. The figure below shows the force of the wall on the ball during the collision. What is the value of Fmax, the maximum value of the contact force during the collision, if the force is applied for ti=26.4 ms?

I was wondering should I use Fnet=ma to find Fmax, but find acceleartion first

Any help would be great

Thanks