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 mov

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
A. 5Kg
B. 7Kg
C. 17Kg
D. 3Kg

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

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