How many seconds after launch does the projectile attain

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Question: A projectile is launched from a platform 35 feet high with an initial velocity of 20 feet per second. The height h of the projectile at t seconds after launch is given by h=-16t^2+20t+35feet.

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

What is the maximum height?

Reference no: EM13593474

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