Current Attempt in Progress

A loaded penguin sled weighing $64\mathrm{.}0$ N rests on a plane inclined at angle $=20\mathrm{.}0$ to the horizontal $($see the figure$).$ Between the sled and the plane, the coefficient of static friction is $0\mathrm{.}240,$ and the coefficient of kinetic friction is $0\mathrm{.}130.($a$)$ What is the minimum magnitude of the force vec$(F),$ parallel to the plane, that will prevent the sled from slipping down the plane? $($b$)$ What is the minimum magnitude $F$ that will start the sled moving up the plane? $($c$)$ What value of $F$ is required to move the sled up the plane at constant velocity?