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An explosion breaks a rock into three pa...

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 m//s` and the second part of mass `2 kg` moves with `8 m//s`. If the third part flies off with `4 m//s` the speed , then its mass is

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