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23 October, 07:15

As Aubrey watches this merry-go-round for a total of 2 minutes, she notices the black horse pass by 15 times. What is the period of the black horse?

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  1. 23 October, 07:43
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    Periodic time is the time taken for one complete oscillation by a body in circular motion. In this case the merry-go round takes 2 minutes to cover 15 complete oscillations. 2 Minutes = 120 seconds

    Hence, 15 oscillations takes 120 secs

    thus 1 oscillation takes 120/15 = 8 seconds

    therefore the period of the merry-go-round = 8 seconds
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