I am doing a review for a Dynamics exam, but I am having trouble with this one question (below). Please note the top of the picture contains the answers. What I have done is make a free body diagram that includes the tension of the cable and the weight of the rider/swing. So according to my calculations for part i: T= mg cos (30) = 680N The tangential acceleration is 0 Which according to the provided solutions is incorrect. Am I missing a force? I figured the tension is integral to finding the velocity of the rider. So I want to get my tension right before I proceed with finding the velocity, though I am also having trouble figuring out how to relate tension and velocity of the acceleration of the rider is 0 I would appreciate an explanation so I can understand.