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JEE Main 2005 Physics question

PhysicsLaws of MotionJEE Main 2005

The upper half of an inclined plane with inclination is perfectly smooth while the lower half is rough. A body starting from rest at the top will again come to rest at the bottom if the coefficient of friction for the lower half is given by

Answer: (3)

Solution

Let each half have length . Work–energy over the whole incline (starting and ending at rest): \sin\cos$φ (l) = 0

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Question ID VK-038521