A ball is thrown directly upward from a height of 8 ft with an initial velocity of 28 ft/sec. The function s(t) = - 16t2 + 28t + 8 gives the height of the ball, in feet, t seconds after it has been thrown. Determine the time at which the ball reaches its maximum height and find the maximum height. The ball reaches its maximum height of ft sec(s) after the ball is thrown. (Type integers or decimals.)

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