An elevator descends into a mine shaft at the rate of 5 metres per minute. If it begins to descend from 20 m above the ground, what will be its position after 1 hour from the ground?
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an elevator descends into mine shaft at the rate of 5 meter per minute. so for 1 min elevator descends 5metres.
we know 1 hour =60 min so 60min x 5metres=300 meters.
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