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Physics, 05.11.2019 07:31 chem1014

Aboy pushes his sister on a swing. what is the
frequency of oscillation of his sister on the swing
if the boy counts 90. complete swings in 300.
seconds?
(1) 0.30 hz (3) 1.5 hz
(2) 2.0 hz (4) 18 hz

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