Question

a bullet of mass 20 g is fired from a pistol of mass 2 kg with horizontal velocity of mass of 150m / s . calculate the recoil velocity of pistol.

Answer 1

m1u1 +m2u2 =m1v1+m2v2
0.020*0+2*0=0.020*150+2*V2
0=3+2*V2
-3/2=V2
V2=-1.5m/s

Answer 2

Answer:

M1u1 +m2u2 =m1v1+m2v2

0.020*0+2*0=0.020*150+2*V2

0=3+2*V2

-3/2=V2

V2=-1.5m/s