A cricket ball of mass 150 g moving with a speed of 12 `ms^(-1)` is hit by a bat so that the ball is turned back with a velocity of ` 20 ms^(-1)` . Calculate the impulse received by the ball ?

Explanation

Given
Mass of the ball , m=150 g
`m=150 xx 10^(-3) kg `
Initial speed of the ball , u= `12 ms^(-1)`
Final speed of the ball , v=`-20 ms^(-1)`
[-ve sign indicates backward direction ]
To find : Impulse , J= ?
Solution
Impulse= Change in linear momentum = Final momentum - Initial momentum
=m(v-u)
`=150 xx 10^(-3)[-20-12]`
`= 150 xx 10^(-3) xx -32`
` J=-4.8 kg ms^(-1)`