# physic

Hi! could you help me to start this problem becuase I had try so many time and did not get it right at all please. Thank you so much.
A rifle with a weight of 20 N fires a 4.0 g bullet with a speed of 260 m/s.
(a) Find the recoil speed of the rifle.

(b) If a 775 N man holds the rifle firmly against his shoulder, find the recoil speed of the man and rifle

1. 4
1. I have a difficult time believing you are having trouble with this.

Consrvation of momentum:

Massrifle*velocityrifle=massbullet*velocitybullet

20/9.8*velocityrifle=.004*260

On the many change 775N to kg first.

posted by bobpursley

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