To see what you should post in the discussion and the rubric for how you will be graded, go to Discussions and scroll down to Lesson Discussions for the description. Topic: The height s above the ground at time t of an object is given by s(t) = -5t² + vt + So where sis in meters, tis in seconds, v is the object's initial velocity in meters per second and so is its initial position in meters. a) If you throw a ball straight up from the ground with an initial velocity of 20 meters per second, how long will it take for the ball to hit the ground? Explain your reasoning. b) If you now throw the ball from the top of a tower which is 80 meters above ground, at the same initial velocity as in part a), when does it hit the ground? Explain your reasoning.

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