Suppose we represent the distance above the ground by a positive integer and that below the
ground by a negative integer. If it begins to descend from 15 m above the ground, what will be
its position after 45 minutes?
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Since downwards is negative, the velocity of the elevator is -5 m/min. ... However, since we started 15 m above ground, displacement from the ground level = -225 + 15 m = -210 m
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