The string of a pendulum of length π is displaced through 90Β° from the vertical and released. Then the minimum strength of the string in order to withstand the tension as the pendulum passes through the mean position is

The string of a pendulum of length π is displaced through 90Β° from the vertical and released. Then the minimum strength of the string in order to withstand the tension as the pendulum passes through the mean position is

Question : The string of a pendulum of length π is displaced through 90Β° from the vertical and released. Then the minimum strength of the string in order to withstand the tension as the pendulum passes through the mean position is