A 1.5 kg block is initially at rest on a horizontal frictionless surface when a horizontal force along an x axis is applied to the block. The force is given by F(x) = (2.5 - x2)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 = 2.0 m? (b) what is the maximum kinetic energy of the block between x = 0 and x = 2.0m?