An object is in free fall .

(A) Only if the weight is the only force acting on the object
(B) Anytime it feels the force of gravity
(C) Only when it's moving vertically down
(D) Anytime it has an acceleration equal to 9.8 m/s/s

i think the answer is b... i am not sure

  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.