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A 0.5 kg block moving at a speed of 12 ms^-1 compresses a spring through a distance 30 cm when its speed is halved.

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A 0.5 kg block moving at a speed of 12 ms-1 compresses a spring through a distance 30 cm when its speed is halved. The spring constant of the spring will be Nm-1.

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Correct answer is 600

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How Ui is zero.
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In initial potential energy will be zero.
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