What is this speed in m/s?

The images of trees in Figure Pl.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.

Transcribed Image Text:

A. 9 108 m/s. C. 5 106 m/s B. 3 109 m/s D. 2 100 m/s