Which of the following is an example oh a physical property

c because the action was the roller coaster reaches bottom of hill (action) reaction would be blood tends to drain away from head

hope this !

what is the actual question though?

friction

explanation:

they us to move forward and backwards

one "light year" is the distance that light travels, through vacuum, in one julian year.   that's 365.25 days, of 24 hours each.