Depends on how well built he is probably for the average American 8 MPH
1) The object slows down due to kinetic friction.
2) The coefficient of kinetic friction is higher on a carpet than on the bare floor, therefore the object would slow down quicker on the carpet
Answer:
Displacement (i.e. change in its final position)
Explanation:
In classical mechanics work is described as the displacement of the body in the direction of the applied force.
<u>Mathematically given as:</u>

where:
F = force on the body
s = displacement of the body
θ = angle between the force and direction of displacement
While force, acceleration, velocity can also be the answer for the blank space but the displacement effect is visible during and even after the work has been done, so one can notice the change in position of the object even when the person has not seen the process but just the initial condition of the body.