The speed of the cart after 3 seconds of low fan speed is cm/s. the speed of the cart after 2 seconds of medium fan speed is cm/s. the speed of the cart after 5 seconds of high fan speed is cm/s.

explanation:

as the height from which the ruler was dropped increased, the speed of the ruler at ryan's hand increased.

  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.

force tends to be low and long diustance masses are high