Chapter 1, Problem 77MSPP

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?

1. A. 9 ×10⁻⁸m/s
2. B. 3 × 10⁻⁹m/s
3. C. 5 × 10⁻⁶m/s
4. D. 2 × 10⁻⁶m/s