20. The accompanying figure shows the plot of distance fallen versus time for an object that fell from the lunar landing module a dis- tance 80 m to the surface of the moon. a. Estimate the slopes of the secant lines PQ,, PQ2, PQ3, and PQ4, arranging them in a table like the one in Figure 2.6. b. About how fast was the object going when it hit the surface? 80 E 60 40 20 5 10 Distance fallen (m)

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