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JEE Main 2026 Physics question

PhysicsLaws of MotionJEE Main 2026

A block takes t time to slide down a plane inclined at 45° to the horizontal. If the surface is made smooth (frictionless), the block takes time t/2 to slide down the plane. The coefficient of friction between the block and the inclined plane is (α/100). The value of α is .

Answer: 75

Solution

Same distance from rest: t∝1/√a. Rough time is twice the smooth time, so

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Question ID VK-015605