A ball is thrown upward from the roof of a school, 16 m high, with an initial velocity of 20 m/s. The height of the ball above the ground at time t is given by the function h(t) = -4.9t² + 20t + 16, t≥ 0 a) Find the height of the ball at t = 1 and t = 2. b) Find the rate of change of the height of the ball at 1 s and 2 s. c) What is the maximum height of the ball?

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