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Cameroon GCE A-Level Physics Practice Questions - Cameroon General Certificate Of Education Advanced Level Physics (Subject Code 0780) Exam

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A block of mass $4.0\text{ kg}$ rests on a rough plane inclined at $30^\circ$ to the horizontal. If the coefficient of static friction between the block and the plane is $\mu = 0.70$ and $g = 9.8\text{ m s}^{-2}$, what is the magnitude of the frictional force acting on the block?
Correct Answer:
19.6 N

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