It takes 0.2 s for a pendulum bob to move from mean position to one end. What is the time period of pendulum ?

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Solution

In the figure, let 'B' be the mean position, 'A' be the end to which the bob traveled and 'C' be the other end.
Then according to the question
B-A = 0.2 s --------- (1)
A-B = 0.2 s --------- (2
B-C = 0.2 s --------- (3)
C-B = 0.2 s --------- (4)
We know that time period is the total time taken by a pendulum to move from mean position to one end and back to mean position and then to the other end and finally coming back to the mean position.
$⟶$ time period= (1)+(2)+(3)+(4)
$⟶$ time period =0.2+0.2+0.2+0.2

=0.8 s

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