Energy - Marbles are rolled down the groove of a ruler raised to different heights to show that there is relation between final speed and initial height.
(Energy - Marbles; are rolled down; to show that there is relation between final speed and initial height) (a ruler; raised; to different heights) (there; is relation between; final speed)
Energy - Marbles a ruler there
are rolled down raised is relation between
to show that there is relation between final speed and initial height
to different heights
final speed