A pendulum swings backwards and forwards passing through Y, middle poi – McqOptions

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1.	A pendulum swings backwards and forwards passing through Y, middle point of the oscillation. The first time the pendulum passes through Y, a stopwatch is started. The twenty-first time the pendulum pass through Y, the stopwatch is stopped. The reading is T.What is the time period of the pendulum?
A.	7740
B.	7721
C.	7720
D.	7710
Answer» E.

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