Does a Slowing Piano Exert More Force Than the Man Pushing It?

[mancity]

Homework Statement

A piano is rolling down a frictionless slope at an ever increasing speed. The piano tuner sees it, slowing it down to a constant speed. The magnitude of the force on the man by the piano is F_MP; the magnitude of the force on the man by the man is F_PM. If we compare these forces, we find
(A) F PM > F MP always.
(B) F PM > F MP while the piano slows down but F PM = F MP when the piano is moving at constant speed.
(C) F PM = F MP always.
(D) F PM = F MP while the piano slows down but F PM > F MP when the piano is moving at constant speed.

Relevant Equations

Newton's third law

Albeit the simple question, I am a bit confused on whether the correct answer choice is (B) or (C). When the piano is slowing down, shouldn't the force received by the piano be a bit greater than the force received by the man?

 

[haruspex]

What does Newton III say?
Why do you think otherwise?

 

[Steve4Physics]

Homework Statement: A piano is rolling down a frictionless slope at an ever increasing speed. The piano tuner sees it, slowing it down to a constant speed.

If the slope is frictionless the piano tuner will slide and will be unable to slow down the piano.

 

[Herman Trivilino]

When the piano is slowing down, shouldn't the force received by the piano be a bit greater than the force received by the man?

Draw well-separated free-body diagrams of piano and the man. Note that the net force on both the man and the piano are nonzero.