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. (b) If a marksman with a weight of 650 N holds the rifle firmly against his shoulder, determine the recoil speed (in m/s) of the shooter and rifle.

a) 0.174 m/s; 0.214 m/s
b) 0.214 m/s; 0.269 m/s
c) 0.269 m/s; 0.321 m/s
d) 0.321 m/s; 0.392 m/s