Question

A bullet of mass 20 gram is fired horizinatally with a speed of 150`m//s` from a pistol of mass 2.5kg. What is the recoil velocity of the pistol ?

Answer 1

Here, `m_(1)=20 gram=(20)/(1000) kg=(1)/(50) kg, v_(1)=150 m//s`
`m_(2)=2.5 kg, v_(2)=?`
From `m_(1)v_(1)+m_(2)v_(2)=0`
`v_(2)=(-m_(1)v_(1))/m_(2)=-(1)/(50)xx(150)/(2.5)=-1.2m//s`
negative sign indicates recoil veloocity of the pisstol.