A boy timed 30 oscillations of a certain pendulum thrice and obtained 1min. 10s, 1min….

A boy timed 30 oscillations of a certain pendulum thrice and obtained 1min. 10s, 1min. 12s and 1min. 7s respectively.The mean period of oscillation of the pendulum is
  • A.
    0.14s
  • B.
    0.43s
  • C.
    2.32s
  • D.
    6.97s
Correct Answer: Option C
Explanation

Total time = (3 x 60) + 29
= 209sec
period (frac{t}{n}) = (frac{209}{90})
= 2.32sec

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