A 100 Kg Stone Attached to a 1

Multiple Choice

A 1.00 kg stone attached to a 1.00 m long string is traveling in a vertical circular path. What is the minimum linear speed needed at the top of the circle to keep the string from going slack?

A) 5.63 m/s
B) 5.31 m/s
C) 5.00 m/s
D) 4.50 m/s
E) 3.13 m/s