A bullet is fired from a rifle with a velocity of 1000 m/s. Its momentum is 20 kg m/s. What will be its mass?

Momentum$=20\mathrm{kg}\mathrm{m}/\mathrm{s}$

Velocity$=1000m/s$

We know,

$\mathrm{Momentum}=\mathrm{mass}\times \mathrm{velocity}$

20 kg m/s = mass × 1000 m/s

mass=$\frac{20}{1000}kg$

mass = $\frac{20 \times 1000}{1000}g$

mass = 20 g

Therefore, the mass of the bullet will be 20 g.