A ball of mass 1.5 kg is tied to a string of length 6.0 m as shown

Question:

A ball of mass 1.5 kg is tied to a string of length 6.0 m as shown in Figure P6.50. The ball is initially hanging vertically and is given an initial velocity of 5.0 m/s in the horizontal direction. The ball then follows a circular arc as determined by the string. What is the speed of the ball when the string makes an angle of 30° with the vertical?

Figure P6.50