Question

A block of mass M is placed on a rough floor of a lift. The coefficient of friction between the block and the floor is μ . When the lift falls freely, the block is pulled horizontally on the floor. What will be the force of friction

Options :

  1. μ Mg

  2. μ Mg/2

  3. 2μ Mg

  4. None of these

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Answer :

None of these

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