1.

According to Newton's law, rate of coolingis proportional to the difference between the temperature of the body and the temperature of the air. If the temperature of the air is 20^(@)C and body cools for 20 min from 100^(@)C to 60^(@)C then the time it will take for it temperature to drop to 30^(@) is

Answer»

30 min
40 min
60 min
80 min

Answer :C


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