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A particle covers half of its total distance with speed v1 and the rest half distance with speed v2. Its average speed during the complete journey is
Options
(a) (v1v2)/(v1+v2)
(b) (2v1v2)/(v1+v2)
(c) (2v1²v2²)/(v1²+v2²)
(d) (v1+v2)/2
Correct Answer:
(2v1v2)/(v1+v2)
Explanation:
Let the tot. distance covered by the particles be 2s. Then
vₐᵥ = 2 s / (s/ v₁ + s/ v₂) = 2 v₁v₂ / v₁ + v₂
Related Questions: - Water falls from a height of 60m at the rate of 15 kg/s to operate a turbine
- Photons with energy 5eV are incident on a cathode C in a photoelectric cell.
- A wheel has angular acceleration of 3.0 rad/sec² and an initial angular speed
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Topics: Motion in Straight Line
(93)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- Water falls from a height of 60m at the rate of 15 kg/s to operate a turbine
- Photons with energy 5eV are incident on a cathode C in a photoelectric cell.
- A wheel has angular acceleration of 3.0 rad/sec² and an initial angular speed
- The horizontal range and maximum height attained by a projectile are R and H,respectively
- Two forces of magnitude 8N and 15N respectively act at a point so as to make the resultant force
Topics: Motion in Straight Line (93)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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