You can
put this solution on YOUR website! .
The plot
The displacement as a given function of time.
For your convenience, I prepared a PLOT for you showing the given polynomial (the displacement function).
Having even very preliminary understanding of basic conceptions, you can analyze from this plot as many as you can.
In the future, you may use your own graphing calculator or even other website plotting tools for visualization.
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You will make it right, if you post your deepest "THANKS" to me for my teaching and guiding.