A shell of mass 3m is moving horizontally through air with velocity u when an internal explosion causes it to separates into two parts of masses m and 2m, which continue to move horizontally in the same vertical plane. If the explosion generates additional energy, of amount 12mu^(2) prove that the two fragments separate with relative speed 6u.

A shell of mass 3m is moving horizontally through air with velocity u

1.	A shell of mass 3m is moving horizontally through air with velocity u when an internal explosion causes it to separates into two parts of masses m and 2m, which continue to move horizontally in the same vertical plane. If the explosion generates additional energy, of amount 12mu^(2) prove that the two fragments separate with relative speed 6u.
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