A stone at the end of a sling is whirled in a vertical circle of radius 1.20

Question:

A stone at the end of a sling is whirled in a vertical circle of radius 1.20 m at a constant speed v0 = 1.50 m/s as in Figure P4.57. The center of the sling is 1.50 m above the ground. What is the range of the stone if it is released when the sling is inclined at 30.0° with the horizontal?
(a) At A?
(b) At B? What is the acceleration of the stone?
(c) Just before it is released at A?
(d) Just after it is released at A?

A stone at the end of a sling is whirled in a vertical circle