Answer:
343000 J
Step-by-step explanation:
P = Power produced by champion = 756 W
h = height gained by the athlete = 500 m
m = mass of the athlete = 70 kg
E = Least amount of energy
Least amount of energy is same as the potential energy gained , So using conservation of energy
Energy spent by athlete = Gravitational potential energy

E = (70) (9.8) (500)
E = 343000 J