Question

A bullet of mass 50g is fired from a rifle of mass 4 kg with an initial velocity of 35m/s calculate the recoil velocity of rifle

Answer 1

Explanation:

Given,

mass of bullet m1 = 50g

mass of rifle m2 = 4 kg = 4x1000g= 4000g

initial velocity u = 35m/sec

we know m1u1 + m2u2 = m1v1 + m2v2

50x 0 + 4000x 0 = 50x 35 + 4000x V2 (since initial velocity is always zero for rifle and bullet).

=> 0+ 0= 1750 + 4000v2

=> – 4000v2 = 1750

=> –v2 =

$1750 \\ - - - \\ 4000$

V2= –0.4375 m/sec

Hope it helps you