1. The problem statement, all variables and given/known data A ball tied to the end of a string .5m in length swings in a vertical circle under the influence ofgravity. When the string makes an angle of 20 with the vertical, the ball has a speed of 1.5 m/s. Find the magnitude of radial and tangential acceleration at this instant. Then find the total acceleration. 2. Relevant equations Circular Motion Ones 3. The attempt at a solution I know Radial, but Tangential has always troubled me. The tangential is the derivative of the velocity vector. The answer says the tangential acceleration=gsin20. Can someone explain that to me? Thanks!