An electric train has a mass of 40,000 kg and moves at 15 m/s. What is its linear momentum?
Answer and explanation
Correct answer: B. 600,000 kg*m/s
- Step 1: Linear momentum is defined as p = m * v.
- Step 2: p = 40,000 kg 15 m/s = 600,000 kgm/s.
Answer
600,000 kg*m/s.
Why not the others: '2,667 kgm/s' divides mass by velocity; '4,500,000 kgm/s' computes kinetic energy without 0.5; '300,000 kg*m/s' divides by 2.
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