A gazelle is running at 17.46 m/s. He sees a lion and accelerates at -1.49 m/s/s. How fast is he running 2.39 seconds later?

  distance on the y-axis and time on the x-axis.

explanation:

the instantaneous velocity = change in position/time taken

the slope of the graph should give instantaneous velocity.

  slope of a graph = change in value of y -axis / change in values of x -axis

  comparing both the equations

    change in value of y -axis = change in position

  change in values of x -axis = time taken

so position values should be on the y axis and time values should be on the x axis.

distance on the y-axis and time on the x-axis.

i think its c if i'm wrong

there are no contact forces mentioned on the list of choices that you've provided.