The figure to the right shows the distance-time graph for a muscle car accelerating from a standstill. Use the information in the figure to answer parts (a) and (b). The table below lists the coordinates of the points. Point Q1 Q2 Q3 Q4 P Coordinates (5.9,108) (13.9,368) (18.2,559) (19.2,609) (20,650) Distance (m) 650 + 325- Q. 10 Elapsed time (sec) 20 -0 (a) Estimate the slopes of the secant lines PQ, PQ2, PQ3, and PQ4. Determine the correct units for these slopes. The slope of secant line PQ is approximately (Round to the nearest integer as needed.)