A body of mass \( 2 \mathrm{~kg} \) moving with a speed of \( 4 \mathrm{~m} / \mathrm{s} \). mak...

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A body of mass \( 2 \mathrm{~kg} \) moving with a speed of \( 4 \mathrm{~m} / \mathrm{s} \). makes an elastic collision with another body at rest and continues to move in the original direction but with one fourth of its initial speed. The speed of the two body center of mass is \( \frac{x}{10} \mathrm{~m} / \mathrm{s} \). The value of \( x \) is
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