If a ball is thrown vertically upward with an initial velocity of 160 ft/s, then its height after t seconds is s = 160t – 16t2. (Consider up to be the positive direction.) (a) What is the maximum height (in ft) reached by the ball? ft (b) What is the velocity (in ft/s) of the ball when it is 384 ft above the ground on its way up? ft/s What is the velocity (in ft/s) of the ball when it is 384 ft above the ground on its way down? ft/s

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