Answer:
101.65 m/s
Step-by-step explanation:
Step one:
Given data
m1= mass of gun.= 480kg
m2= mass of bullet. = 85kg
v1=
v2= final velocities of bullet. = 18 meters per second
m1u1+m2u2=m1v1+m2v2
u1=0; u2=0
0=m1v1+m2v2
Step two:
Recoil velocity v1= -(m1/m2)v2
v1= -(480/85)18
v1= 5.64*18
v1=101.65 m/s