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Stored energy of a closed system of mass 138kg increases by 1257kJ during a certain period. During that period, the velocity goes from 11m/s to

Stored energy of a closed system of mass 138kg increases by 1257kJ during a certain period. During that period, the velocity goes from 11m/s to 79m/s and it elevates from 0 to 17m. Find change in the internal energy (U) of the system.

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