8. Suppose we represent the distance above the ground by a positive integer and that below the ground by a negative integer, then answer the following:
(i) An elevator descends into a mine shaft at the rate of 5 metre per minute. What will be it position after one hour ?
(ii) If it begins to descend from 15 m above the ground, what will be its position after 45 minutes.
Answer:
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Step-by-step explanation:
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