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physics

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A model rocket is launched straight upward with an initial speed of 30.0 m/s. It accelerates with a constant upward acceleration of 1.50 m/s2 until its engines stop at an altitude of 170 m.
(a) What is the maximum height reached by the rocket? (b) How long after lift-off does the rocket reach its maximum height(c) How long is the rocket in the air?

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