Question : A body of mass 2 kg attached to a string is whirled in a vertical circle of radius 5 m. The minimum speed of the body at lowest point so that the cord does not slacken even at the highest point is
(A) 15.65ms^{-1}
(B) 6.75ms^{-1}
(C) 45.83ms^{-1}
(D) 20.87ms^{-1}
Answer : option (A)
Solution :
