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An explosion blows a rock into three parts , two parts go off at right angles to each other .
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An explosion blows a rock into three parts , two parts go off at right angles to each other . these two are , 1kg first part moving with a velocity of 12m/s and 2kg second part moving with a velocity of 8m/s . if the third part files off with a velocity of 4m/s ., its mass would be ?
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