A rectangular block has a square base me...

A rectangular block has a square base measuring `axxa` and its height is `h`. It moves on a horizontal surface in a direction perpendicular to one of the edges. The coefficient of friction is `mu`. It will topple if

`mugt(h)/(a)`

`mugt(a)/(h)`

`mugt(2a)/(h)`

`mugt(a)/(2h)`

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