1. The problem statement, all variables and given/known data A 50 KG box was dragged across a floor for a distance of 20 meters at a constant velocity by Steve pushing on the box at an angle of 30 degrees below the horizontal. If the coefficient of kinetic friction between the box and the floor is 0.20, calculate the work he did. 2. Relevant equations How can you solve for velocity in this situation? Is it necessary? Also, what is the answer to this problem? 3. The attempt at a solution So far I have set up Delta K + Delta E (thermal) = Work, but I cannot progress because K = 1/2mv^2 has velocity in it, which I cannot find.