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What is the minimum value of F needed so...

What is the minimum value of F needed so that block begins to move upward on frictionless incline plane as shown

A

`Mg tan ((theta)/(2))`

B

`Mg cot((theta)/(2))`

C

`(Mg sin theta)/((1+sin theta))`

D

`Mg sin ((theta)/(2))`

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