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 PQ1 , PQ2 , PQ3 , and PQ4 , 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 sec .
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