Question

If 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 an mine shaft at the rate of 4m per minute. What will be its position after one hour?

(ii) If it begins to descend from 10m above the ground, what will be its position after 40 minutes from the ground?
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Answer 1

Answer:

I)240m

ii)170m

Step-by-step explanation:

I)Distance it travels per minute=4m

no of minute in an hour=60

its position after 1 hour=60x4=240m.

ii)distance it will travel in 49 minutes=40x4=160

if it starts descend 10 m above the ground,

then,its position after 40 minutes is 160+10=170m.