88. The ball weighing m = 200 g, is suspended on a string of length l = 56 cm, oscillates in a vertical plane. The strength of yarn tension T when the yarn is at an angle α = 50 ° with the vertical equal to 4.5 H. Determine the velocity of the ball at that time.

Detailed solution. Decorated in Microsoft Word 2003. (Target decided to use formula editor)