In Exercises a distance-time graph is shown.

(a) Estimate the slopes of the secants PQ_1,  PQ₂, PQ₃, and PQ₄, arranging them in order in a table. What is the appropriate unit for these slopes?
(b) Estimate the speed at point P.

The accompanying figure shows a distance-time graph for a wrench that fell from the top platform of a communication mast on the moon to the station roof 80 m below.

Transcribed Image Text:

Distance fallen (m) 80 60 40 20 0 2₁ ON lad 23 5 Elapsed time (sec) P 10 1