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This animation shows graphs of position, velocity, and acceleration vs. time for a 2-kg red block (not shown to scale) pushed by a 12-N force on a frictionless horizontal surface (position is given in meters and time is given in seconds).  Restart.  The red block is in contact with (and therefore pushes on) the green 1-kg block (also not shown to scale).  Click here to show and play the physical situation.