A 5g bullet is fired from a 5000g gun. If the bullet leaves the gun going +800m/s, with what speed does the gun recoil?

Answer 1

-.8m/s

Answer 2

Speed of recoil of the gun = change in momentum/mass of the bullet
= 5 x 10-3 x 800/5 msec-1 = 0.8 msec-1
(Found on wiki answers (searched on google))