Question: An object, with mass m and speed v relative to an observer, explodes into two pieces, one three times as massive as the other; the

An object, with mass m and speed v relative to an observer, explodes into two pieces, one three 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?

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