Momentum
A body of mass 2 kg moving with a velocity of 10 m/s collides with another body of mass 3 kg at rest. If they stick together after collision, what is their common velocity?
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About This Question
- Subject
- physics
- Chapter
- laws of motion
- Topic
- momentum
- Difficulty
- Medium
- Year
- 2025
Solution
Correct Answer:
4 m/s
- Collision Type: This is a 'completely inelastic collision' where kinetic energy is not conserved, but momentum is.
- Momentum Before: m1u1+m2u2=(2×10)+(3×0)=20 kg·m/s.
- Momentum After: (m1+m2)v=(2+3)v=5v.
- Conservation Law: 5v=20.
- Result: v=4 m/s.
This medium difficulty physics question is from the chapter laws of motion, covering the topic of momentum. It appeared in the 2025 exam.
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