A man travels in a lift to the top of a tall office block. The lift starts from rest on the ground floor and moves vertically. It comes to rest again at the top floor, having
moved a vertical distance of 27 m. The lift initially accelerates with a constant
acceleration of 2 ms-2 until it reaches a speed of 3 ms-1. It then moves with a
-2
constant speed of 3 ms-1 for T seconds. Finally it decelerates with a constant
deceleration for 2.5 s before coming to rest at the top floor.
-1