_ 9. A marathin runner runs at a constant speed of 2.20 m/s for 10.0 s. She increases her speed to 3.60 m/s during the next 18.1 m. a) Prepare: draw a pictorial diagram and identify the variables used it ; b) What is the displacement of the runner after the 10.0 s? c) What is her acceleration during the 18.1 m travel? d) What is the elapsed time during the 18.1 m travel? e) Draw a graph of the position vs. time and the velocity vs. time. Using the information given or your calculations, put numerical magnitudes on both axes. X (m) v (m/s) t (s) t (s)