Question

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A bullet of mass 28 g is fired from a pistol of mass 2.8 kg at a velocity of 200 ms-1. Calculate the recoil velocity of the pistol.
1) 2 ms-1
2) - 2 ms-1
3) - 4 ms-1
4) 4 ms-1​

Answer 1

Answer:

ANSWER

Initial momentum of the system  Pi=0

Given:  Mbullet=0.02 kg      Vbullet=100 m/s         Mgun=8 kg

Let the recoil velocity of gun be V.

Applying the conservation of linear momentum :  Pf=Pi

Or   MgunV+MbulletVbullet=0

Or   8V+0.02×100=0

⟹ V=−0.25 m/s

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Answer 2

Answer:

Initial momentum of the system Pi=0

Given: Mbullet=0.02 kg Vbullet=100 m/s Mgun=8 kg

Let the recoil velocity of gun be V.

Applying the conservation of linear momentum : Pf=Pi

Or MgunV+MbulletVbullet=0

Or 8V+0.02×100=0

⟹ V=−0.25 m/s