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Units and Dimensions

A cricket bal...

Question

A cricket ball of mass $200 g m$ moving with velocity $15 m / s$ is brought to rest by a player in $0.05 s e c$ . What is the impulse of the ball and average force exerted by player?

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Solution

$I m p u l s e = c h a n g e i n m o m e n t u m = m (v - u) = 0.2 (0 - 15) = - 3 N s$
$A v e r a g e f o r c e = I m p u l s e / T i m e = \frac{3}{0.05} = 60 N$

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