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An oscillation of a block was started by pulling the block 2.5 cm down and then...

An oscillation of a block was started by pulling the block 2.5 cm down and then released. The period is measured to be 0.25 s. If the oscialltion was restarted by pulling the block 1cm and thenr eleasing it, what would be the period? why? I believe the period would be the same, I just need an explanation!

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