A system of two objects has a total momentum of \( (18 \mathrm{~kg} \mathrm{~m} / \mathrm{s}) \h...

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A system of two objects has a total momentum of \( (18 \mathrm{~kg} \mathrm{~m} / \mathrm{s}) \hat{i} \) and its center of mass has the velocity of \( (3 \mathrm{~m} / \mathrm{s}) \hat{\mathrm{i}} \). One of the objects has the mass \( 4 \mathrm{~kg} \) and velocity \( (1.5 \mathrm{~m} / \mathrm{s}) \hat{\mathrm{i}} \). The mass of the other object (in \( \mathrm{kg}) \) is
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