JEE Main Physics question
A body of mass hangs at one end of a string of length , the other end of which is fixed. It is given a horizontal velocity so that the string would just reach the position where it makes an angle of with the vertical. The tension in the string at the mean position is
Answer: (A)
Solution
. At the mean position: T-mg=mv^2/l=mg\Rightarrow T=2mg.