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A boy of mass M is applying a horizontal...

A boy of mass M is applying a horizontal force to slide a box of mass M on a rough horizontal surface. The floor is `mu` and the between the box and the floor is `mu'`. In which of the following cases it is certainly not possible to slide the box?

A

`mu lt mu', M lt M'`

B

`mu gt mu', M lt M'`

C

`mu gt mu', M gt M`

D

none of these

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