A spring $($k$-200$ N$/$m$)$ is foed at the top of a frictionless plane inclined at angle $0-30\%$A$1\mathrm{.}2$ kg block is projected up the plane, from an initial position that is distance d$=0\mathrm{.}60$ m from the end of the relaxed spring, with an initial kinetic energy of $26$ J$.($a$)$ What is the kinetic energy of the block at the instant it has compressed the spring $0\mathrm{.}30$ m$?($b$)$ With what kinetic energy must the block be projected up the plane if it is to stop momentarily when it has compressed the spring by $0\mathrm{.}40$ m$?$