A bullet of mass 5 g is fired at a velocity of `900 ms^(-1)` from a rifle of mass 2.5 kg. What is the recoil velocity of the rifle.?

Options

A. `0.9 ms^(-1)`
B. `180 ms^(-1)`
C. `900 ms^(-1)`
D. `1.8 ms^(-1)`

Answer

D

Explanation

`m_(1)v_(1) = m_(2)v_(2)` or `v_(2) = (m_(1)v_(1)/(m_(2))`
`v_(2) = (5 xx 10^(-3)xx900)/(2.5) = 1.8 ms^(-1)`