A 1.4 kg ball at the end of a 1.9 m string swings in a vertical plane. At its lowest point the ball is moving with a speed of 20 m/s.

a. What is its speed (in m/s) at the top of its path?

b. What is the tension (in N) in the string when the ball is at the bottom and at the top of its path?

   i. bottom of its path

   ii. top of its path