1.) the objects have the same temperature
this is the answer because thermal equilibrium is when two substances touch and the temperature becomes the same.
electron cloud and nuclei
speed = (change in distance) / (time for the change)
distance from top to bottom of segment c = (6 - 0) = 6 m
time from beginning to end of segment c = (14 - 4) = 10 s
speed = (6 m) / (10 s)
speed = 6 m/s