Question

3. A block of wood of mass 1.5 kg rests on an inclined plane. If the coefficient of static friction between the surfaces
in contact is 0.3, find (i) greatest angle to which the plane may be tilted without the block slipping, and (ü) the
force parallel to plane necessary to prevent slipping when the angle of plane with horizontal is 30°.
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Answer 1

I don't know what is the answer.