A pendulum is timed, first for 20 swings and then for 50 swings:
time for 20 swings = 17.4s
time for 50 swings = 43.2 s
Calculate the average time per swing in each case.
The answers are slightly different. Suggest some
possible experimental reasons for this.

grav potential energy

increase masses, decrease separation

  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.