Question

Please solve the following questions .

Answer 1

50)

Solution :-

after 1hour=5×60=300. It's position will be=15-300=-285=285m below the ground.

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30)

Solution :-

(a) After 25 minutes the temperature will be 0°C.

(b) It will take 100 minutes i.e., 1 hour and 40 minutes.

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Answer 2

Question 1.(50)

The rate of descend of the elevator is 5m/min

so, After 1hr = 60 minutes, the elevator descends (5×60) = 300 m.

Therefore, the position of the elevator will be 300m below the ground.

& the second part

It descends 45×5 = 225m within 45min.

So the position will be (225-15) = 210m below the ground.

Question 2.(30)

i.

the substance decreases (1°×25÷5) = 5° within 25min. Therefore the final temperature will be (5-5)° = 0°

ii.

According to the question,

initial temperature= 5°

final temperature= -15°

Change of temperature= 5°-(-15°) = 20°

Time needed = (20×5) = 100min = 1hr 40min

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