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**1. Homework Statement**

A 64.0 g tennis ball with an initial speed of 28.0 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=17.4 ms?

http://capa.physics.mcmaster.ca/figures/kn/Graph09/kn-pic0910_new.png [Broken]

**2. Homework Equations**

mvi = mvf

Momentum is conserved?

**3. The Attempt at a Solution**

I am totally clueless as to where to start i dont even know if this really is a momentum question i am only assuming if you guys can just point me in the rite direction. Thanks

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