, apple 1 is dropped from a bridge onto a roadway beneath the bridge. Somewhat later, apple 2 is thrown down from the same height. The figure gives the vertical positions y of the apples versus t during falling, until both apples have hit the roadway. With approximately what speed is apple 2 thrown down? Take .
At time
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the distance of the drop for the first apple ( h ):
the time of the second apple is 1.25 s
the speed of the second apple:
so the answer is 9.6 m/s