suppose we represent the distance above the ground by a positive integer that below the ground by a negative integer if an elevator descends at a rate of 5m/ min and begin descends from 15 meter above the ground, what will be it's position after 45 minutes
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Since downwards is negative, the velocity of the elevator is -5 m/min.(i) Displacement = Velocity x Time = -5 m/min x 60 min = -300 m.(ii) Displacement from initial position = Velocity x Time = -5 m/min x 45 min = -225 m.
However, since we started 15 m above ground, displacement from the ground level = -225 + 15 m = -210 m.
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