Question

a simple pendulum completes 20 oscillations in 30 seconds. how much time will it take to go from the extreme position to the mean position?

Answer 1

When 20 oscillations are completed in 30 seconds, then the time taken for 1 oscillation can be calculated as 2/3 seconds.

1 oscillation route comprises of the pendulum travelling from the mean position to the extreme position on one side, then back to the mean position again and swing to the extreme position of the other side and again back to mean position.

Hence, the time taken from extreme to the mean position is calculated as 2/3 / 4 = 1/6 second.