A 25 gram bullet (0.025 kg) is fired from a gun with a speed of 210 m/s. If the gun has a mass of 0.91 kg. when rounded to 2 significant figures what is the recoil speed of the gun?
1 Answer
Jan 10, 2017
The gun recoils at
Explanation:
This is a conservation of momentum problem. The initial momentum of the system (gun + bullet) is zero, as neither is moving.
There fore, after the gun is fired, the total momentum must still be zero.
Inserting what we know:
The negative sign tells us that the gun travels in a direction opposite to that of the bullet.