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A batsman deflects a ball by an angle of...

A batsman deflects a ball by an angle of `45^(@)` without changing its initial speed which is equal to `54 km/h` . What is the impulse imparted to the ball ? ( Mass of the ball is 0.15 kg)

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Impulse is directed along the bisector of the initial and final directions. Its magnitude is
` 0.15 xx 2 xx 15 xx cos 22.5^@ = 4.2 kg ms^(-1)`
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