A wrecking ball suspended from a 12.0m cable is accelerated up to 5.00m/s at it's lowest point. After that point the ball has negative aceleration as it gains elevation. What is the ball's velocity when the cable makes a 20.0 degree angle with the verticle? Is this just a matter of finding the height of the ball at that point and calculating the velocity at that height? I guess I could use the potential energy formula (U=mgh) some how. I'm just not sure on this one.