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# An elevator is stopped at the ground floor. It starts moving upwards at constant acceleration a>0 for 5 seconds. It then keeps a constant speed for 35 seconds. Finally, it slows down with an acceleration of the same magnitude (but opposite direction) −a , until it comes to a halt at the top floor. The top floor is 370 meters above the ground floor. (a) What is the maximal speed v of the elevator ? (in m/s)

MIT 8.01 Physics I Classical Mechanics, Fall 1999