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An elevator has to travel from the ground level of a 60 m tall building to its top. During the acceleration phase, its acceleration must

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An elevator has to travel from the ground level of a 60 m tall building to its top. During the acceleration phase, its acceleration must not exceed 4 ms ; when it decelerates, it must not exceed 6ms - (in absolute value). What is the minimum time needed for the elevator to move from ground to top floor?

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