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For a particle performing SHM, equation ...

For a particle performing `SHM`, equation of motion is given as `(d^(2))/(dt^(2)) + 9x = 0`. Find the time period

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`(d^(2)x)/(dt^(2)) = -4x, omega^(2), omega = 2`
Time speed, `T = (pi)/(omega) = pi`
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