What is the definition of free fall

Free fall is a type of acceleration.

Explanation:

In free fall, gravity applies constant force on the object causing a constant increase in velocity. If you were to measure the distance an object fell, each second ... it would fall further because it is constantly picking up speed. Hope this helps.

  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.