A certain string can withstand a maximum tension of 40 Newton without breaking.

A person ties a 0.37 kilogram stone to one end, holding the other end whirls the stone in a vertical circle of radius 0.91 meter.

The speed of the stone is slowly increased until the string breaks.

a) Where is the stone on its path when the string breaks and state the equation for the tension force at where the string breaks?

b) What is the speed of the stone as the string breaks?