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Pull back on the purple block. Choose 'Show Position' to see a plot of position as a function of time. Choose 'Show Velocity' to see both position and velocity plotted on the same graph. Choose 'Show acceleration' to see all three plots.

Change the amplitude, either as a compression or extension, and see how the graphs change. Choose, 'Change spring' to see the vibrations of a mass on a stiffer spring.