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A toy rocket has an engine that causes it
to accelerate upwards at a rate of 3.50 m/s². It is
launched from an unknown height above the ground by
turning the engine on. Exactly 5.00 s after the launch, the
engine turns off, and eventually the rocket falls all the
way to the ground. The total time the rocket is in the air
is 11.0 s.
From what height above the ground was the rocket
initially launched?

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