A \( 50 \mathrm{~g} \) mass hangs at the end of a massless spring. When \( 20 \mathrm{~g} \) mor...

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A \( 50 \mathrm{~g} \) mass hangs at the end of a massless spring. When \( 20 \mathrm{~g} \) more are added to the end of the spring, it stretches \( 7.0 \mathrm{~cm} \) more. (a) Find the spring constant. (b) If the \( 20 \mathrm{~g} \) are now removed, what will be the period of the motion ?
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