A lift,on its upward journey,starts from rest and accelerates for 5s until it reaches a velocity of 2m/s^-1.After this ,it moves at a constant speed for 10s and then retards to rest after another 5s.
For its downward journey,it again stars from rest and accelerates for 10s until it reaches a velocity of 3m/s^-1.Then it retards to rest after another 10s.
Sketch the velocity-time graphs for both the upward and downward journey made by the lift.
Calculate
(i)its acceleration during the upward journey
(ii)its retardation during the downward journey

Question

anonymous · Answer

(iii)what can you say about the areas under the two velocity-time graph.