### Maximum height problem by using derivative

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##### Reference no: EM13117400

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 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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