A 160$160$ kg carton is pulled up 3.00$3\mathrm{.}00$ m and low−$-$friction plank onto the back of a truck .$5.$ If the back of the truck is 1.25$1\mathrm{.}25$ m above the ground, what force is required to move the carton at a constant speed up the plank and what is the work done?