A clerk moves a box of cans down an aisle by pulling on a strap attached to the box. The clerk pulls with a force of 176.0 N at an angle of 30.0◦ with the horizontal. The box has a mass of 40.0 kg, and the coefficient of kinetic friction between the box and floor is 0.520. The acceleration of gravity is 9.81 m/s2 . What is the acceleration of the box? Answer in units of m/s2. Okay, this should be a simple problem, but I don't understand what it means when it says 'with the horizontal' and how that would look on my FBD. Help me please?