Question 1044875
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A ball is thrown directly upward from a height of 7 ft with an initial velocity of 20 ​ft/sec. 
The function ​s(t)=−16t^2+20t+7 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
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