Answer:4.04 m
Step-by-step explanation:
mass of athlete

initial speed

To get the maximum height h of Athlete we conserve energy i.e.
Kinetic Energy of Athlete=Potential energy gained by athlete




(b)Speed at half of maximum height
Considering v be the velocity at half of maximum height
conserving Energy we can write

(as
)
thus




So Athlete interact with the gravitational Field of Earth