JAMB Physics 2020 Objective — Question 30
Question 30 of 40 from the Joint Admissions and Matriculation Board (JAMB) Physics 2020 Objective paper, with the correct answer and a full explanation.
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30. 50g of water at 20°C is added to 200g of water at 80°C. If properly stirred, determine the temperature of the mixture.
- A. A. 40°C
- B. B. 56°C
- C. C. 68°CCorrect
- D. D. 86°C
Explanation
Heat lost by hot water = heat gained by cold water: 200(80-x) = 50(x-20). 16000-200x=50x-1000. 17000=250x. x=68°C.
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