A ball hits a wall horizontally at 6.0 m s"'. It rebounds horizontally at 4.4 m s-1. The ball is in contact with
the wall for 0.040 s. What is the acceleration of the ball ?
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initial velocity = 6 m/s ( forward)
final velocity = 4.4 m/s ( backward) = -4.4 m/s ( forward )
acceleration = change in velocity/time
= ( -4.4 -6)/ 0.04 = -10.4/0.04
= -1040/4 = -260 m/s² ( forward )
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