1. The problem statement, all variables and given/known data Sheldon moves a box of comic books to stuarts comic book store by attaching a rope to the box and pulling with a force of 90 N at an angle of 30. The box of comic books has a mass of 20 kg and the coefficient of kinetic friction between the bottom of the box and the sidewalk is .5. Find the acceleration of the box 2. Relevant equations F=ma 3. The attempt at a solution i know the answer is A=.12 m/s^2 but i have no idea how to get to that answer, please explain!!