A block rests on a rough inclined plane ...

A block rests on a rough inclined plane making an angle of `30 ^@` with the horizontal . The coefficient of static friction between the block and the plane is 0.8 If the frictional force on the block is 10 N the mass of the block is `" "(g=10 ms ^(-2))`

10 m

4 m

20/7 m

5 m

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