I'm having trouble figuring out this problem. I'm not sure what equations to use or how to start it, can anyone help?? 1. A ball is attached to a string (extentionless and massless, of course) of length L. The string is attached to a frictionless pivot point. When the string is vertical, the ball is a distance h above the horizontal ground. The ball and string are released from rest at an angle θ1 from vertical (θ1 < 90°) and the string is straight. You may place a sharp knife somewhere so that it cuts the string and allows the ball to launch. Derive a formula for the desired angle from vertical θ2 (in terms of the given variables and possibly other constants) for the following situations: Maximum launch speed Maximum landing speed Maximum horizontal launch distance as measured from a location below the ball and string when they hang vertically Maximum horizontal launch distance as measured from the launch point Maximum launch height as measured from the ground Maximum launch height as measured from the launch point Calculate the above numerically when L = 2.00 m, h = 0.50 m, and θ1 = 40°. I'm guessing it has something to do with conservation of energy. How would I use those equations to derive formulas for these scenarios?