A 4.50 g bullet has a muzzle velocity of 250 m/s when fired by a rifle with a weight of 20.0 N. (a) Determine the recoil speed (in m/s) of the rifle.

a) 0.375 m/s
b) 0.450 m/s
c) 0.525 m/s
d) 0.600 m/s