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Q.

A body cools from  60° C to  40° C in 6 minutes. If, temperature of surroundings is  10° C . Then after the next 6 minutes, its temperature will be ________ °C

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answer is 28.

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Detailed Solution

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Applying Newton’s law of cooling
60−406=K60+402−10   _____(I)40−T6=K40+T2−10      _____(II)
(I) ÷ (II)
⇒2040−T=80T+20⇒T=28∘C

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