Question

A lift (elevator) starts from rest at the ground floor of a building.
Fig. 1.2 is the speed-time graph for the motion of the lift to the top floor of the building.
4.0
speed m/s
3.0 2.0 1.0
00 5 10 15 20 25
[3]



Fig. 1.2
time/s
Use the graph to determine the distance from the ground floor to the top floor of the building.
distance =

Answer 1

Answer:

p={0,6,12,18,24,30,....}

q={0,24,48,72,96,120,....}

(P-Q)={6,12,18,30,....}

(Q-P)={48,72,96,120....}

(P-Q) U (Q-P) = {6,12,18,30,48,72,96,120}

(P-Q) INTERSECTS (Q-P) = { }