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2015-06-12T11:52:53+05:30

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Initial velocity (u) = -10 m/s
Final velocity (v) = 15 m/s
Mass of the ball (m) = 150 g = 150/1000 = 0.15 kg
Time of interaction (t) = 0.02 second.

   v = u + at
⇒a = (v - u) / t     [Acceleration is the change in velocity per time taken]
      = (15 -(-10)) / 0.02 
      = (15 + 10) / 0/02
      = 25 / 0.02
      = 1250 m/s²

Force (F) = m × a
              = 0.15 × 1250
              = 187.5 kg.m/s² or 187.5 N
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