The muzzle velocity of a 0.003-kg paintball pellet is 90 m/s. If it takes 0.002 s for the pellet to be shot from the paintball gun, what is the average force of the recoilon the paintball gun? 
选项为:A:$$24N$$  B:$$60N$$  C:$$68N$$  D:$$135N$$  请回答其中一个选项.