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A block is resting on a horizontal surface. The mass of the block is 40 kg....

A block is resting on a horizontal surface. The mass of the block is 40 kg. The coefficient of static friction between the block and the surface is us = 0.3 and the coefficient of kinetic friction is uk = 0.20. A man then decides to push on the block with 30 newtons of horizontal force.

a) What is the acceleration of the block? Explain.

b) Suppose the man pushes on the block with 200 newtons instead. What is the acceleration of the block? Explain.

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