A $5$ kg package slides $2\mathrm{.}8$ m down a long ramp that is inclined at $24$ degrees below the horizontal at a constant speed. The coefficient of kinetic friction between the package and the ramp is Mk $=0\mathrm{.}3.$ Calculate a$)$ the work done on the package by fraiction b$)$ the work done on the package by gravity c$)$ the work done on the package by the normal force d$)$ the total work done on the package