A 2 kg stone is swung in a vertical circle by attaching it at the end of a string of length 2m. If the string can with stand a tension 140.6N, the maximum speed with which the stone can be rotated is

• A

  22 ms^–1

• B

  44 ms^–1

• C

  33 ms^-1

• D

  11 ms^–1