1. The problem statement, all variables and given/known data A 50.0 kg carton is dragged up a low-friction plank onto the back of the truck. The length of the plank is 3.00 m and it makes an angle of 15.0º with the ground. With respect to the bottom of the plank, the gravitational potential energy of the carton on the truck is 2. Relevant equations ep=mgh 3. The attempt at a solution im not sure what i have to do with the 15 degrees in order for me to solve the equation.