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An exploision blows a rock into three pa...

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

A

7 kg

B

17 kg

C

3 kg

D

5 kg

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