A 100 g bullet leaves a gun with a velocity of 200 m per second. The bullet's momentum is:

1. Momentum p = m × v. 2. Convert mass to SI units: 100 g = 0.1 kg. 3. Substitute: p = 0.1 × 200. 4. p = 20 kg metre per second. 5. Option A forgets the factor of 100, option C forgets the conversion to kilograms. _Source: Selina Concise Physics ICSE Class 9, Ch 3 'Laws of Motion' (aplustopper.com extract)_