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21. A projectile is launched from a platform 18 feet high with an initial velocity of 104 feet per second, The height h of the

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21. A projectile is launched from a platform 18 feet high with an initial velocity of 104 feet per second, The height h of the projectile at / seconds after launch is given by h = -161- + 104 + 18 feet. (a) How many seconds after launch does the projectile attain maximum height? Show work. (b) What is the maximum height? Show work. AY

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