In a separate experiment the student used the same objects and tray, but glued a piece of gritty sandpaper to the tray. what
results would be expected?
the items would slide faster at the same heights.
the items would start to slide when the tray is not lifted as high.
the items would not slide at all, no matter how high the tray is raised
the tray would need to be raised higher before the items start to slide