Question 119

An explosion breaks a rock into three parts in a horizontal plane. Twoof themgooff at right angles to each other. Thefirst part of mass 1 kg moves with a speed of 12 $$ms^{-1}$$ and the secondpart of mass 2 kgmoves with 8 $$ms^{-1}$$ speed. If the thirdpart flies off with 4 $$ms^{-1}$$ speed, then its mass is :


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