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A body cools from \( 50.0^{\circ} \mathrm{C} \) to \( 49.9^{\circ} \mathrm{C} \) in \( 5 \mathrm{~s} \). How long will it take to cool from \( 40.0^{\circ} \mathrm{C} \) to \( 39.9^{\circ} \mathrm{C} \) ? Assume the temperature of
\( \mathrm{P} \) the surroundings to be \( 30.0^{\circ} \mathrm{C} \) and Newton's law of cooling to be valid :
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(A) \( 2.5 \mathrm{~s} \)
(B) \( 10 \mathrm{~s} \)
(C) \( 20 \mathrm{~s} \)
(D) \( 5 \mathrm{~s} \)
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