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 and 2 kg second part moving with a velocity of 8 ms -1 . If the thirds part files off with a velocity of 4 ms -1 , its mass would be :

1. A. 3 kg
2. B. 5 kg
3. C. 7 kg
4. D. 17 kg

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