below is a graph of the magnitud of the force a s a function of time for a bounc

Question

below is a graph of the magnitud of the force a s a function of time for a bouncy ball colliding with a not so bouncy wall. the ball has a mass of 29 g, and its initial velocity is 30 meters per second, perpendicular to the wall. After the collition with the wall, it is moving at exactly the same speed in the negative direction. Find Fmax during the collision.

please help i am so confused with this problem. the solution of this problem should the one below but i dont know where the 2 on the red box comes from. PLEASEEE HELPP!!

Explanation / Answer

Actually it is the change in momentum,

Force* delta(t) = Change in momentum = final momentum - initial momentum = Pf - (Pi) = Pf - (-Pf) = 2*Pf = 2*Pi

Pf and Pi are equal in magnitude just opposite in direction.

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