V2 = V1 + a*t.
V2 = -8 m/s, V1 = 30 m/s, t = 0.010 s, a = ?.
A tennis ball with a velocity of 30.0 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 0.010 s, what is the average acceleration of the ball while it is in contact with the wall?
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