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.)

Explanation

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)`