An explosion blows a rock into three parts. Two parts go off at right an...

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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, 

1 kg first part moving with a velocity of 12 ms−1−1 and 2 kg second part moving with a velocity 8 

ms−1−1. If the third part flies off with a velocity of 4 ms−1−1, its mass would be

sol:





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