A body at rest spontaneously breaks up into two parts which move in opposite directions. The parts have rest masses of 3 kg and 5.33 kg and respective speeds of 0.8c and 0.6c. The rest mass of the original body is kg (up to two decimal places)

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A body at rest spontaneously breaks up into two parts which move in opposite directions. The parts have rest masses of 3 kg and 5.33 kg and respective speeds of 0.8c and 0.6c. The rest mass of the original body is kg (up to two decimal places)

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