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The images of trees in Figure P1.68 come from a catalog advertising fast-growing trees. If we mark the position of the top of the tree in the successive years, as shown in the graph in the figure, we obtain a motion diagram much like ones we have seen for other kinds of motion. The motion isn't steady, of course. In some months the tree grows rapidly; in other months, quite slowly. We can see, though, that the average speed of growth is fairly constant for the first few years.
Figure P1.68
69. What is this speed in m/s?
- A. 9 ×10−8m/s
- B. 3 × 10−9m/s
- C. 5 × 10−6m/s
- D. 2 × 10−6m/s
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