A ball player catches a ball 3.55 s s after throwing it vertically upward. with what speed did he throw it

i believe he threw the ball up at about 18 mph

Explanation:

f=ma a/f/m a= 480/60 a = 8m/s/s that is quick wow

  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.