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A rifle of 20kg mass can fire 4 "bullets...

A rifle of `20kg` mass can fire 4 "bullets"//"s". The mass of each bullet is `35 xx 10^(-3) kg` and its final velocity is `400ms^(-1)`., Then what force must be applied on the rifle so that it does not move backwards while firing the bullets ? .

Text Solution

Verified by Experts

Law of conservation of momentum `MV +4mv =0`
`rArrV = - (4mv)/(M) = -(4 xx35xx10^(-3)xx400)/(20) =-2.8ms^(-1)`
Force applied on the rifle
`F =(MV)/(t) = - (20xx2.8)/(1) = - 56 N` .
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