A simple pendulum of length 100 cm  performs S.H.M. Find the restoring force  acting on its bob of mass 50 g when the  displacement from the mean position is  3 cm.
A simple pendulum performs S.H.M of  period 4 seconds. How much time after  crossing the mean position, will the  displacement of the bob be one third of  its amplitude.
HSC Board Physics 2023 Question Paper