A 100 g bullet leaves a gun with a velocity of 200 m per second. The bullet's momentum is:
A2 kg metre per second
B20 kg metre per second
C2000 kg metre per second
D200 kg metre per second
Answer & Solution
Correct answer: B. 20 kg metre per second
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)_
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