20. (10 points) A projectile is launched from a platform 8 feet high with an initial velocity of 72 feet per second, The height h
20. (10 points) A projectile is launched from a platform 8 feet high with an initial velocity of 72 feet per second, The height h of the projectile at f seconds after launch is given by h(t) = - 16t2 + 72t + 8 feet (a) How many seconds after launch does the projectile attain maximum height? (b) What is the maximum height
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