question_answer

By increasing the velocity by 1 m/s a man finds his K.E. is doubled. His original speed was:

A)  \[\text{(}\sqrt{\text{2}}\text{-1)m/s}\]               

B)         \[\sqrt{\text{2}}\,\text{m/s}\]

C)        \[\frac{\text{1}}{\text{(}\sqrt{\text{2-1)}}}\text{m/s}\]

D)        \[\text{2}\sqrt{2\,}\text{m/s}\]