Question

From a rifle of mass 4 kg, a bullet
of mass 50 g is fired with an
initial velocity of 35 m s-l.
Calculate the initial recoil velocity
of the rifle.​

Answer 1

4.3m/s

According to law of conservation of linear momentum

m1v1 = m2v2 ..........1

m1=mass of rifle=4kg

v1=velocity of rifle=?

m2=mass of bullet=0.5kg

v2= velocity of bullet =35m/s

putting values

v1= m2v2/m1

=0.5×35/4

v1=4.3 m/s