First slide

Law of conservation of momentum and it's applications

Question

A gun fires a bullet of mass 50 gm with a velocity of $30 m \sec^{- 1}$ . Because of this the gun is pushed back with a velocity of $1 m \sec^{- 1}$ . The mass of the gun is

Moderate

A

15 kg
B

30 kg
C

1.5 kg
D

20 kg

Solution

$m_{G} = \frac{m_{B} v_{B}}{v_{G}} \frac{50 \times 10^{- 3} \times 30}{1} = 1 .5 kg$

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