2. (a)A person runs circular track of radius 20 m. He makes 4 complete laps in 5 minutes. Determine his angular speed in rad/s. (b) A O.1 kg ball attached to end of 0.5 m long string rotating in a vertical circle of radius 0.5. At the bottom of the circle its speed is 4 m/s. Determine the tension of the string at this point. - 0 .5 m 4 m/s (c) Determine weight of 100 kg object at a height (from the surface of the earth) equal to 1.5 times the earth radius. Mas of the earth =5.98x1024 kg, Radius of the earth=6.4x10 m, G=6.67x10-11