Posted by **Henry** on Thursday, December 8, 2011 at 7:13pm.

A 1.5 kg ball strikes a wall with a velocity of 7.9 m/s to the left. The ball bounces off with a velocity of 6.7 m/s to the right. If the ball is in contact with the wall for 0.21 s, what is the constant force exerted on the ball by the wall?

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