A block of mass m is resting on the floor of a lift. The coefficient of friction between the block and the
floor is u. When the lift is falling freely, the limiting frictional force between block and surface is
umg
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A block of mass m is resting on the floor of a lift. The coefficient of friction between the block and the
floor is u. When the lift is falling freely, the limiting frictional force between block and surface is
umg
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