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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

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 and 2 kg second part moving with a velocity of 8 ms. If the third part flies off with a velocity of 4 ms', its mass would be: (a) 7 kg (c) 3 kg (b) 17 kg (d) 5 kg

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