Question: The position function s(t) = -4.9t + 78.4 gives the height (in meters) of an object that has fallen from a height of 78.4 meters

The position function s(t) = -4.9t + 78.4 gives the height (in meters) of an object that has fallen from a height of 78.4 meters after t seconds. (a) Explain why there must exist at a time t, 1

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