The recoil velocity of a 4.0 kg rifle th...

The recoil velocity of a 4.0 kg rifle that shoots a 0.050 kg bullet at a speed of `280 ms^(-1)` is:

A

`+ 3.5 ms ^(-1)`

B

`- 3.5 ms ^(-1)`

C

`- sqrt ((3.5) ) ms ^(-1)`

D

`+ sqrt ((3.5))ms ^(-1)`

Verified by Experts

The correct Answer is:

B

`m _(1) u _(1) + m _(2) u _(2) = 0`
`implies u _(1) = - ( m _(1) u _(2))/( m _(1)) =- ( 0.050 xx 280)/( 4) = - 3.5 ms ^(-1)`

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