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JEE Main Physics question

PhysicsLaws of MotionJEE Main

A box of mass m kg is placed on the rear side of an open truck accelerating at a ms⁻². The coefficient of friction between the box and the surface below it is 0.4. The net acceleration of the box with respect to the truck is zero. The value of m is (g = 10 ms⁻²)

Answer: (D)

Solution

The box moves with the truck without sliding as long as the required friction (ma) does not exceed the maximum available (μmg),

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Question ID VK-153018