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Question: Answered & Verified by Expert
A body takes time t to reach the bottom of an inclined plane of angle θ with the horizontal. If the plane is made rough, time taken now is 2t. The coefficient of friction of the rough surface is
PhysicsLaws of MotionJEE Main
Options:
  • A 3 4 tanθ
  • B 2 3 tanθ
  • C 1 4 tanθ
  • D 1 2 tanθ
Solution:
2215 Upvotes Verified Answer
The correct answer is: 3 4 tanθ
μ=tanθ( 1 1 n 2 ) =tanθ( 1 1 2 2 )= 3 4 tanθ

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