The accompanying figure shows the plot of distanc…

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Problem 15

Speed of a car The accompanying figure shows the time-to-distance graph for a sports car accelerating from a standstill. a. Estimate the slopes of secants $P Q_{1}, P Q_{2}, P Q_{3},$ and $P Q_{4}$ , arranging them in order in a table like the one in Figure 2.6 . What are the appropriate units for these slopes? b. Then estimate the car's speed at time $t=20 \mathrm{sec}$.

Answer

a. Check the explanation. b. 50 $\mathrm{m} / \mathrm{sec}$

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