Final answer:
The athlete does 448,400 Joules of work.
Step-by-step explanation:
The work done by an athlete can be calculated using the equation:
Work = Force x Distance
Given that the force exerted by the athlete is 1121N and the distance traveled is 400m, we can substitute these values into the equation:
Work = 1121N x 400m = 448,400 Joules (J)
Therefore, the athlete does 448,400 Joules of work.