In the given system, a block of mass m i...

In the given system, a block of mass m is resting on a board which makes an angle `theta` with the horizontal. What should be the minimum value of `theta`, so that the block just starts moving downwards? The coefficient of friction between the surfaces of the board and the block is `mu`.

`tan^(-1)(1//mu)`

`tan^(-1)(mu)`

`sin^(-1)mu`

none

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