Question

Why can a small Mass of
Bullet kill a person when fired from a gun

Answer 1

When a bullet is released from a gun it has very high speed of velocity approximate 150km/hr
Due to which the person dies

Answer 2

It is so because even if the mass of the bullet is small, it moves out of the gun with a very high velocity, due to which the momentum produced is high (p = mv). This high momentum of the bullet kills a person.