Question: A 5-kg block is held at rest against a vertical wall by a horizontal force of 100 N. (a) What is the frictional force exerted

A 5-kg block is held at rest against a vertical wall by a horizontal force of 100 N.

(a) What is the frictional force exerted by the wall on the block?

(b) What is the minimum horizontal force needed to prevent the block from falling if the coefficient of friction between the wall and the block is µs = 0.40?

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