You are exploring a planet and drop a small rock from the edge of a cliff. In coordinates where the +y direction is downward and neglecting air resistance, the vertical displacement of anobject released from rest is given by y – Yo =-gplanett2, where gplanet is the acceleration due to gravity on the planet. You measure t in seconds for several values of y – Yo in metersand plot your data with t² on the vertical axis and y - Yo on the horizontal axis. Your data is fit closely by a straight line that has slope 0.400 s2/m. Based on your data, what is the valueof gplanet?

we have to understand the graph.

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