The question is ambiguous. (Perhaps the wording is your own, rather than that of the original question?) It asks for the energy of the body. Is this referring to kinetic energy? It also has potential energy, and the two add up to 625J, the given answer.
However, potential energy only has meaning for a system, not a single body. So perhaps only the KE of the body should be counted. But it can also be argued that kinetic energy depends on the frame of reference, and the question does not indicate what frame of reference is to be used.