1. The problem statement, all variables and given/known data Two packing crates of masses m1 = 10.0 kg and m2 = 3.00 kg are connected by a light string that passes over a frictionless pulley as in Figure P4.26. The 3.00 kg crate lies on a smooth incline of angle 42.0°. Find the acceleration of the 3.00 kg crate. 2. Relevant equations 3. The attempt at a solution i know exactly how to do this problem, and i got the right answer. I just cant figure out why you are allowed to use the same angle to the ground of the inclined plane to solve the problem, as in this picture: http://www.fearofphysics.com/Probs/mech041fig02.jpg why are both theta's the same?