A rock was thrown from a 225m high place. Below, a person is walking, z(s) = s– 15s? + 63s – 49. Let z meters be the distance of the person from the position that is right below the rock at s seconds. %3D a. max height of rock? b. speed of rock when it landed? c. when is the person at rest? d. will the rock fall on the person? why or why not

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