A body cools from 50^@C to 49.9^@C in 5 ...

A body cools from `50^@C` to `49.9^@C` in 5 s. How long will it take to cool from `40^@C` to `39.9^@C`? [Assume the temperature of surroundings to be `30^@C` and Newton's law of cooling to be valid]

A

2.5 s

B

10 s

C

20 s

D

5 s

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