The recoil velocity of a 4kg rifle that shoots a bullet of mass 0.05 kg at a apeed 280 `ms^(-1)` is

Options

A. `sqrt(3.5) ms^(-1)`
B. `3.5 ms^(-1)`
C. `-3.5 ms^(-1)`
D. `-sqrt(3.5) ms^(-1)`

Answer

c

Explanation

`v_(2) =(m_(1)v_(1))/(m_(2))`
`=-(0.05 xx 280)/( 4 )`
`=-3.5 ms^(-1)`