Question

a bullet of mass 20 g is fired with the rifle the bullet takes 0.02sec to move through a barrel and leaves with a velocity of 250m/s what is the force exerted by rifle on bullet​

Answer 1

Explanation:

By the law of conservation of momentum,

Initial momentum = find momentum

∴P

1

=P

2

∴m

1

v

1

=m

2

v

2

here, m

1

=20gm.v

1

=200ms

−1

,m

2

=20kg=20,000gm

∴v

2

=

m

2

m

1

v

1

=

20,000

20×200

∴

v

2

=0.2

m/s

∴ option (c) is correct.

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