An explosion breaks a rock into three parts in a horizontal plane. Two of them go off at right angles to each other. The first part of mass 1 kg moves with a speed of 12 ms -1 and the second part of mass 2 kg moves with 8 ms -1 speed. If the third part flies off with 4 ms -1 speed, then its mass is

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

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