It would be the last graph. The height of the leaf is falling at 0.25 per second, therefore it must reach 1 feet per 4 seconds, and since the intervals on this graph are by two, I would make it 2 feet per 8 seconds to make it easier. If we look on all of the graphs where 8 seconds is, we see on the last graph that it has fallen two feet in eight seconds.
The leaf starts at 12 feet above the ground. This eliminates the <u>first and third</u> graph, leaving the second and last.
The leaf falls at 0.25 ft/sec. This means it would take 4 seconds for the leaf to fall 1 foot.
On the <u>second graph</u>, when we go over to 4 seconds and then up, the line is at 10 feet; this means it fell 2 feet in 4 seconds. This is <u>too fast</u>.
On the <u>last graph</u>, going over to 4 seconds and then up, the line is at 11 feet; this means it fell 1 foot in 4 seconds. <u>This is correct</u>.