A \( 0.5 \mathrm{~kg} \) block moving at a speed of \( 12 \mathrm{~ms}^{-1} \) compresses a spri...

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A \( 0.5 \mathrm{~kg} \) block moving at a speed of \( 12 \mathrm{~ms}^{-1} \) compresses a spring through a distance \( 30 \mathrm{~cm} \) when its speed is halved. The spring constant of the spring will be
\( \mathrm{Nm}^{-1} \).
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