Enter values for the initial velocity and acceleration along x in the
spaces below, and then click on "Initialize" to set these values. Then
click on "Play" to run the simulation. You can also step forward or
backward one step at a time, pause the animation, or start again with
the same values with "Reset". To read coordinate values on the graphs,
go to a point with the cursor, which becomes a crosshair, and click on
the point. A small yellow window will come up with the coordinates of
the point and stay up as long as you hold down the mouse button.