physics物理(heat)

A████B
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heat

Q: AB is a metal rod. It is being heated at end A.Finally, will the average kinetic energy of the atoms at end B be equal to that of the atoms at end A? Please explain.

我認為答案是yes.因為heat is transfered from end A to end B by conduction.Though the atoms at end A will vibrate vigorously first, finally, the temp. at end B must be the same of that at end A.

但根據MODELLED ANS：
temp. at end B< temp. at end A∴average KE of atoms at end B< that of atoms at end A
這怎解釋？