Question

2 kg ice at $0^0$ C is mixed with 8 kg of water at 20${}^0$ C. The final temperature is

• A. $0^0$ C
• B. ${20}^0$ C
• C. ${80}^0$ C
• D. none of these

Answer 1

The correct option is A $0^0$ C

$2000\times 80+2000\times 1\times T=8000\times (20-T)\times 1\Rightarrow 160000+2000T=160000-8000T\Rightarrow 10000T=0\Rightarrow T=0$