A body of mass M is applying horizontal ...

A body of mass `M` is applying horizontal force to slide a box of mass `M_(1)` on a rough horizontal surface The coefficient of friction between the shoe of the boy and the floor is `mu` and that between the box and the floor is `'mu_(1)'` In which of the following cases is it certainly not possible to slide the box ? .

`mu lt mu', M lt M'`

`mu gt mu', M lt M'`

`mu lt mu', M gt M'`

`mu gt mu', M gt M'`

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