Speed of a car The accompanying figure shows the time-to-distance graph for a sports car...

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.