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A \( 10 \mathrm{~kg} \) ball and a \( 20 \mathrm{~kg} \) ball approach each other with velocties...
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A \( 10 \mathrm{~kg} \) ball and a \( 20 \mathrm{~kg} \) ball approach each other with velocties \( 20 \mathrm{~m} / \mathrm{s} \) and \( 10 \mathrm{~m} / \mathrm{s} \) respectively. What are their velocities after collision, if the collision is perfectly elastic?