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A boy timed 20 oscillation of a certain pendulum three times and obtained 44.3s, 45.5s, ...

A boy timed 20 oscillation of a certain pendulum three times and obtained 44.3s, 45.5s, and 47.7s respectively. Calculate the mean period of oscillation of the pendulum ____________

A. 0.135
B 2.225
B. 2.26s
C. 44.30s
D. 45.17s





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