A bucket tied at the end of a 1.6 m long string is whirled in a vertical circle with constant speed. What should be the minimum speed so that the water from the bucket does not spill, when the bucket is at the highest position (Take g = 10 m/s2)
(A) 4 m/s
(B) 6.25 m/s
(C) 16 m/s
(D) None of the above