Question

a bullet is fired from a gun with speed 800m/s .if momentum of 40kg.m/s .find mass of bullet

Answer 1

Answers: Let velocity of gun is v.

There is no external force acting, so linear momentum will conserve.

Before the firing, Linear Momentum =0

After the firing, Linear momentum =0.04×400+10×v

⇒0.04×400+10×v=0 ⇒v=−1.6m/s

Hence, 1.6m/s opposite to the direction of the bullet.

Answer 2

Answer:

The time taken to cover the horizontal distance of 100 m from the gun to the target is given by

t =

During this time, the bullet will fall down vertically under gravity.

Hence, height h = ut +

= 0 +

= 5 5 cm