Average Velocity
A car covers first half of a distance at speed v1 and second half at speed v2. Average speed is:
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About This Question
- Subject
- physics
- Chapter
- kinematics
- Topic
- average velocity
- Difficulty
- Medium
- Year
- 2025
Solution
Correct Answer:
2 v1 v2 /(v1+v2)
Let the total distance be 2D.
- Time taken for the first half: t1=v1D.
- Time taken for the second half: t2=v2D.
- Total time Ttotal=t1+t2=v1D+v2D=D(v1v2v1+v2).
- Average speed vavg=Total TimeTotal Distance=D(v1v2v1+v2)2D=v1+v22v1v2. This is the harmonic mean of the two speeds.
This medium difficulty physics question is from the chapter kinematics, covering the topic of average velocity. It appeared in the 2025 exam.
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