A block of mas M is resting on an inclin...

A block of mas M is resting on an inclined plane as shown in the figure. The inclination of the plane to the horizontal is gradually increased. It is found that when the angle of inclination is `theta` the block just begins to slide down the plane. What is the minimum force F applied parallel to the plane that would just make the block move up the plane ?

`Mg sin theta`

`mgcos theta`

`2 Mg cos theta`

`2Mg sin theta`

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