a handball is hit toward a wall with a velocity of 13.7 m/s in the forward direction.it returns with a…

a handball is hit toward a wall with a velocity of 13.7 m/s in the forward direction.it returns with a velocity of 11.5 m/s in the backward direction. if the time interval which the ball is accelerated is 0.021 s, what is the handball’s average cceleration?
 
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