A 6 kg box slides down a long, frictionless incline of angle 34 degrees. It starts from rest at time t = 0 at the top of the incline at a height 17 m above the ground. The acceleration of gravity is 9.81 m/s^2 : What is the original potential energy of the box relative to the ground? i just dont know what to do with the angle. the formula is U = mgy, but where does the angle come into play?