1. The problem statement, all variables and given/known data Hi guys and gals, Having an issue with this one and was hoping to get some help. I'm going to write out the equation and include an attachment with my free body diagram. Q: How long a force parallel to a 20° hill does it take to push a 100-lb box up the hill at a constant speed of 30 ft/s if the coefficient of the kinetic friction between the box and the hill is 1/3. 2. Relevant equations F=ma fk=uk(Fn) w=mg m=w/g v=30ft/s 3. The attempt at a solution F=ma F=(100lb/32.2fts^2)(0) =0 I just can't seem to wrap my head around this one. There really isn't a good explanation in the book. I've included my free body diagram. Thanks for the help.