a elevator descends into a mine shaft at the rate of 7meter per minute.if it descends starts from 20 meter above the fround level.find the time taken by the elevator to reach 400 meters.
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the initial length =20 m
the final length =400 m
the change in length =380 m
divide 380 m by 7m/minute then the time taken was 54 minutes 29 seconds
the final length =400 m
the change in length =380 m
divide 380 m by 7m/minute then the time taken was 54 minutes 29 seconds
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