Question

When a bullet is fired from a rifle its momentum become 20 kg m/s. If the velocity of the bullet is 1000 m/s what will be its mass?

Answer 1

There is no force acting on it so we can apply conservative of momentum here .

20=1000×m
m=20/1000=0.02kg.


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Answer 2

The mass of the bullet is 0.02 kg.

Explanation:

Given that,

Momentum of the bullet when it is fired from a rifle is 20 kg-m/s. The velocity of the bullet is 1000 m/s.

To find,

Mass of the bullet.

Solution,

Momentum of an object is given by :

p = mv

m is the mass of the object

v is the speed of object

$m=\dfrac{p}{v}$

$m=\dfrac{20\ kg-m/s}{1000\ m/s}$

m = 0.02 kg

So, the mass of the bullet is 0.02 kg.

Learn more,

Momentum

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