Question: An object is launched from a platform. Its height (in meters ), x seconds after the launch, is modeled by: h(x)=-5x^(2)+20x+60 How many seconds after

An object is launched from a platform. Its height (in meters ), x seconds after the launch, is modeled by: h(x)=-5x^(2)+20x+60 How many seconds after launch will the object land on the ground? seconds

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