Question

A pendulum is released from P. It takes 0.2 s to swing from P to Q and another 0.2 s from Q to R. The pendulum is at its lowest point at R. What is the frequency of pendulum?
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Answer 1

time period=0.2×2×4 seconds
= 1.6 seconds
frequency=1/time period = 1/1.6Hz
=0.625 Hz