Question

A bullet of mass 10 g is fired with an initial velocity of 20 m/s from a rifle of mass 4 kg. calculate the initial recoil velocity of the rifle ?​

Answer 1

Answer:

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Answer 2

Answer:

The initial recoil velocity of the rifle is 0.05 m/s.

Explanation:

Given data:

• Mass of bullet (m1) = 10 gm
• Initial velocity (v) = 20 m/s
• Mass of rifle (m2) = 4 kg

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To find:

Initial velocity of the rifle.

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Solution:

According to the law of conversation of momentum,

p = mv

where p is the momentum, m is mass and v is the velocity.

By substituting the values, we get

⟹ 0 = 0.01 × 20 + 4 × v

⟹ 0 = 0.2 + 4v

⟹ v = –0.05 m/s.

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∴ Initial velocity of the rifle (v) = –0.05 m/s.