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JEE Main 2013 Physics question

PhysicsLaws of MotionJEE Main 2013

A body starts from rest on a long inclined plane of slope 45°. The coefficient of friction between the body and the plane varies as μ = 0.3x, where x is distance travelled down the plane. The body will have maximum speed (for ) when x =

Answer: (4)

Solution

Speed is maximum when the acceleration becomes zero: \sin$45° = μ

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Question ID VK-103988