a lift on its upward journey starts from rest and accelerates for 5 s 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 starts 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 grahs for both the upward and downward journey made by the lift

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