A machine gun of mass $$10$$ kg fires $$20$$ g bullets at the rate of $$180$$ bullets per minute with a speed of $$100$$ m s$$^{-1}$$ each. The recoil velocity of the gun is:

A

$$0.02$$ m s$$^{-1}$$

B

$$2.5$$ m s$$^{-1}$$

C

$$1.5$$ m s$$^{-1}$$

D

$$0.6$$ m s$$^{-1}$$