We are required to apply the relationship between periodic time and frequency.

Periodic time:

$\overline{){\mathbf{f}}{\mathbf{=}}\frac{\mathbf{1}}{\mathbf{T}}{\mathbf{=}}\frac{\mathbf{c}\mathbf{y}\mathbf{c}\mathbf{l}\mathbf{e}\mathbf{s}}{\mathbf{t}}}$ T is the periodic time, t is the time for x cycles

An object that completes 20 vibrations in 10 seconds has a frequency of _________.

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