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A 3.1 kg block is initially at rest on a horizontal frictionless surface when a horizontal...

A 3.1 kg block is initially at rest on a horizontal frictionless surface when a horizontal force in the positive direction of an x axis is applied to the block. The force is given by F(x) = (6.8-x^2) i N, where x is in meters and the initial position of the block is x = 0. (a) What is the kinetic energy of the block as it passes through x = 3.9 m? (b) What is the maximum kinetic energy of the block between x = 0 and x = 3.9 m?

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