. A 150 g mass tied to a string is being whirled in a vertical circle of radius 30 cm with uniform speed. At the lowest position, the tension in the string is 9.5 N. calculate, i) The speed of the mass.
m = 0.150 kg
R = 0.30 meter
T = tension = m g + m v^2/R = m (g+v^2/R)
9.5 = 0.150 ( 9.81 + v^2 / 0.30)
solve for v