# (ENEM 2011) - Question Hard of Physics

One of the modalities present in the Olympics is pole vaulting. The stages of one of an athlete's jumps are represented in the figure. Disregarding dissipative forces (air resistance and friction), in order for the jump to reach the highest possible height, that is, for the maximum amount of energy to be conserved, it is necessary that:
a.
The kinetic energy, represented in stage II, is completely converted into gravitational potential energy, represented in stage IV.
b.
The kinetic energy, represented in stage I, is completely converted into elastic potential energy represented in stage IV.
c.
The kinetic energy, represented in stage I, is completely converted into gravitational potential energy, represented in stage III.
d.
The gravitational potential energy, represented in stage II, is completely converted into elastic potential energy, represented in stage IV.
e.
The gravitational potential energy, represented in stage I, is completely converted into elastic potential energy, represented in stage III.