to push a $20$ kg crate up a ramp with kinetic friction coefficient $0\mathrm{.}005$ angled at $45$ degrees above the horizontal, a worker exerts a force of $600$ N parallel to the incline. The crate slides up the ramp $2$ m$.$ Find $($A$)$ how much work is done on the crate by the worker. $($b$)$ what is the speed of the crate at $2$m$.($c$)$ After the crate reaches the $2$m mark the worker lets go of the crate and it slides down. Find the velocity of the crate at the bottom of the ramp.