Question

By a bullet fire by a gun is more dangerous than a bullet fire with medium speed?

Answer 1

According to Newton's third law, when we fire a bullet we get a recoil of the gun due to action-reaction.

And, the momentum of recoil = the momentum of fired bullet $=mass\times velocity=mv$

So, from here it is quite clear that the velocity of the fired bullet more will be the momentum results in more dangerous recoil.

$\text{Force}=\frac{\text{Change in momentum}}{\text{time}}$

If change in the momentum is large then value of force will be large.

Therefore, bullet fire by a gun is more dangerous than bullet fire with medium speed.