A 3.0 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)=(8.5-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 = 4.3 m?
(b) What is the maximum kinetic energy of the block between x = 0 and x = 4.3 m?