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A batsman hits back a ball of mass 0.4 kg straight in the direction of the bowler without changing its initial speed of 15 ms^–1 .

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A batsman hits back a ball of mass 0.4 kg straight in the direction of the bowler without changing its initial speed of 15 ms–1 . The impulse imparted to the ball is _______________Ns.

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Answer is 12

Impulse = change in momentum 

= m[v – (–v)] = 2 mv 

= 2 × 0.4 × 15 = 12 Ns

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