An explosion blows a rock into three par...

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 12`ms^(-1)` and 2kg second part moving with a velocity of 8 `ms^(1)`. If the third part flies off with a velocity of 4 `ms^(-1)` , its mass would be

5 kg

7 kg

17 kg

3 kg

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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) and 2 kg second part moving with a velocity of 8 ms^(-1) . If the third part flies off with a velocity of 4 ms^(-1) . Its mass would be

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