After setting up his system, Charles needs to test it. He puts some weight on a sled at the base of the hill so it has a combined mass of 45 kg and connects it to his pulley. Then he puts 30 kg on the other end of the pulley and lets it fall into a hole he dug in the center of the hill. What is the dynamical acceleration of the sled? Hint: Use the angle you solved for in the previous problem