Now, Emma directs her flashlights at the ceiling and floor of the freight car. The flashlights are located midway between the ceiling and the floor and Emma switches them on at the same time.
In Emma's frame of reference, which surface, ceiling or floor, is struck by light first, or are they struck at the same time? Which surface is struck first in your frame of reference?
In which frame of reference (yours or Emma's) does the light travel a longer distance from the flashlight to the ceiling of the car? In which frame of reference (yours or Emma's) does the light spend more time traveling toward the ceiling?