Question

A rifle of mass 4.4kg fires a bullet of mass 11 gm with a muzzle velocity of 800m/s with what velocity the rifle recoil

Answer 1

hey
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mass of rifle = 4.4 kg
mass of bullet = 11gm

velocity it takes to come out = 800m/s
recoil velocity = ?

from the conservation of momentum

m1u1 = m2v2
44/10 *u1 = 11/1000 *800
u1 = 2 m/s

for the calculation refer the attachment

hope helped
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Answer 2

M rifle = 4.4 kg             V rifle    = ?

M bullet =  0.011 kg       V bullet = 800 m/s

By law of conservation of momentum

                       4.4 x V rifle = 0.011 x 800

V rifle =  8.8 / 4.4 =2 m/s