When a bullet is fired from a rifle its momentum becomes 20 kg m / s. If the velocity of the bullet is 1000 m / s, then what is its mass?

Question

When a bullet is fired from a rifle its momentum becomes 20 kg m / s. If the velocity of the bullet is 1000 m / s, then what is its mass? (A) 30 g (B) 5 kg (C) 20 g (D) 500 g

Tardigrade Admin · Accepted Answer

Given, Momentum of bullet after firing =20 kg ms -1 Velocity =1000 ms -1 We know that, p=m v ⇒ m=(p/v)=(20/1000) kg ⇒ m=(20/1000) × 1000 g ⇒ m=20 g

Q. When a bullet is fired from a rifle its momentum becomes $20 k g m / s$ . If the velocity of the bullet is $1000 m / s$ , then what is its mass?

$30 g$

$5 k g$

$20 g$

$500 g$

Given,
Momentum of bullet after firing $= 20 k g m s^{- 1}$
Velocity $= 1000 m s^{- 1}$
We know that, $p = m v$
$\Rightarrow m = \frac{p}{v} = \frac{20}{1000} k g$
$\Rightarrow m = \frac{20}{1000} \times 1000 g$
$\Rightarrow m = 20 g$

Q. When a bullet is fired from a rifle its momentum becomes 20kgm/s. If the velocity of the bullet is 1000m/s, then what is its mass?

30g

5kg

20g

500g