An object is released from rest (its initial velocity is zero) from a skyscraper at a height of 1230 ft above street level (see figure below). The height of the object can be modeled by the position function s = f(t) = 1230 – 16².. %3D 1230 0. (a) Is the object still falling at t = 4 s? (b) Find the average velocity of the object over the time interval from t = 4 tot = 5 s. ft/s (c) Find the object's instantaneous velocity at time t = 4 s. ft/s

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