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A ball is thrown straight up from the too of a building 128 ft. tall with...

A ball is thrown straight up from the too of a building 128 ft. tall with qn initial velocity of 48 ft per second. The distance s(t) (in feet) of the ball from the fround is given by s(t)=128+48t-16t^2. Find the maximum height attained by the ball.
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