Question

bullet of mass 0.02 kg is fired from a gun of mass 10 kg. If recoil velocity of the gun is 0.4 m/s then what is the initial velocity of the bullet? (write in SI unit, no need to write the unit)​

Answer 1

Answer :

›»› The velocity of bullet is 200 m/s.

Given :

• Bullet of mass 0.02 kg is fired from a gun of mass 10 kg. If recoil velocity of the gun is 0.4 m/s.

To Calculate :

• The initial velocity of the bullet?

Calculation :

• Mass of bullet (m₁) = 0.02 kg
• Mass of gun (m₂) = 10 kg
• Velocity of gun (v₂) = 0.4 m/s
• Initial velocity of bullet (v₁) = ?

We can find velocity of bullet by using the law of conservation of moment which says m₁v₁ = m₂v₂

From law of conservation of moment

→ m₁v₁ = m₂v₂

→ 0.02 * v₁ = 10 * 0.4

→ 0.02v₁ = 10 * 0.4

→ 0.02v₁ = 4

→ v₁ = 4/0.02

→ v₁ = 200

║Hence, the velocity of bullet is 200 m/s.║