The surface charge density on an infinite charged plane is - 1.70 x 10^-6c/m^2 . a proton is shot straight away from the plane at 2.20 x 10^6m/s .
how far does the proton travel before reaching it's turning point?

it is called kinetic energy

  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.

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hope this !