Relative Velocity
Two trains are moving in opposite directions with velocities 60 km/h and 40 km/h respectively. A bird is flying at 80 km/h in the same direction as the faster train. What is the relative velocity of the bird with respect to the faster train?
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About This Question
- Subject
- physics
- Chapter
- kinematics
- Topic
- relative velocity
- Difficulty
- Medium
- Year
- 2025
Solution
Correct Answer:
20 km/h
- Vector Notation: Let the direction of the faster train (Train A) be positive (+X).
- vA=+60 km/h.
- Bird's velocity vB=+80 km/h (same direction).
- Relative Velocity Rule: The velocity of object B relative to A is vBA=vB−vA.
- Substitution:
- vBA=80−60=20 km/h.
- Conclusion: To a passenger on the faster train, the bird appears to be moving forward at 20 km/h.
- Note: The velocity of the second train (40 km/h) is irrelevant to this specific question.
This medium difficulty physics question is from the chapter kinematics, covering the topic of relative velocity. It appeared in the 2025 exam.
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