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JEE Main Physics question

PhysicsLaws of MotionJEE Main

The upper half of an inclined plane with inclination φ 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: (C)

Solution

For the smooth upper half (length l): v² = 2g sinφ · l. For the rough lower half, the body decelerates from this v

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Question ID VK-153106