A $3\mathrm{.}4$ 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$($s$)=(3\mathrm{.}7-$ 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 $=2\mathrm{.}4$ m$?($b$)$ What is the maximum kinetic energy of the block between x $=0$ and x $=2\mathrm{.}4$ m$?$