I've been killing myself over this problem because I cannot figure it out. Can someone please help me?(adsbygoogle = window.adsbygoogle || []).push({});

A tennis ball with a velocity of 40.0 m/s to the right is thrown perpendicularly at a wall. After striking the wall, the ball rebounds in the opposite direction with a velocity of -8 m/s to the left. If the ball is in contact with the wall for 0.014 s, what is the average acceleration of the ball while it is in contact with the wall?

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# Motion and Average Acceleration -Help-

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