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A projectile is launched from a platform 20 feet high with an initial velocity of 112 feet per second, The height h of the projectile

A projectile is launched from a platform 20 feet high with an initial velocity of 112 feet per second, The height h of the projectile at t seconds after launch is given by h = -16t 2 + 112t + 20 feet.

(a) How many seconds after launch does the projectile attain maximum height?

(b) What is the maximum height?

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