The string of 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 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 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