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2014-08-23T22:17:50+05:30

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Let us assume the ball is stopped in t seconds.
 v = u + at        0 = - 72 * 5/18 + a t        a = 20 / t  m/sec²

average Force =  m * a = 0.4 * 20 / t = 8 / t  Newtons.

If the ball is stopped in 0.2 seconds,  average Force = 40 Newtons
average force depends on the time duration.
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