Block mover

A block rests on a 10 meter long board which is attached to the ground by a hinge on one end. The other end can be lifted to any height between completely horizontal and vertical. The coefficient of static friction between the block and the board is 0.7. You slowly lift the board. The block will start moving when the angle between the hinged end of the board and the ground reaches what value? (Nearest whole angle value)

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