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A rocket is fired from the top of a platform. Its height h, in meters, above the ground, after t seconds, is given by the

A rocket is fired from the top of a platform. Its height h, in meters, above the ground, after t seconds, is given by the function ht=-5t2+10t+20.

What is the maximum height reached by the rocket?

How long did it take to reach the maximum height?

Please explain with all the process. Thanks

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