Question

a bullet of 50g mass from rifle of 4kg mass has intial velocity 35m/s. find recoil velocity

Answer 1

hey there

mass of bullet = 50/1000 = 1/20

mass of rifle = 4kg

initial velocity = 35 m/sec

we know

MV = - mv

v = - MV/m

= - (4 x 35)/(1/20)

= - 2800 m/sec

Answer 2

mass of bullet,m=50g
=50/1000
=0.05kg
velocity,v=35m/s
mass of rifle,m=4kg
mass of bullet*velocity of bullet=mass of gun*recoil velocity of rifle
0.05*35=4*recoil velocity of rifle
recoil velocity of rifle=0.05*35/4
recoil velocity of rifle=0.4375