A circket ball of mass 150 g is moving with a velocity of `12ms^(-1)` and is hit buy a bat so that the ball is turn back with a velocity of `20ms^(-1)`. If the duration of contact between the ball and bat is 0.01 s, find the impulse and the average force exerted on the ball by the bat.

Explanation

According to given problem change in momentum of the ball
`Deltap=p_(f)-p_(i)=m(v-u)=150xx10^(-3)(20-(-12))=4.8 N-s`
So by impulse-momentum theorem, impulse I=change in moment `Deltap=4.8 N-s`
And by time averaged definition of force in case of impulse `F_("av")=(I)/(Deltat)=(Deltap)/(Deltat)=(4.80)/(0.01)=480N`