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# An object, with mass 67 kg and speed 11 m/s relative to an observer, explodes into...

An object, with mass 67 kg and speed 11 m/s relative to an observer, explodes into two pieces, one 5 times as massive as the other; the explosion takes place in deep space. The less massive piece stops relative to the observer. How much kinetic energy is added to the system during the explosion, as measured in the observer's reference frame? Sorry for using pencil my pen stopped working suddenly.

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