A) \[{{7.1}^{o}}C\]
B) \[{{9.2}^{o}}C\]
C) \[{{10.5}^{o}}C\]
D) \[{{12.1}^{o}}C\]
Correct Answer: A
Solution :
According to law of conservation heat. \[ms\,\Delta t=\frac{1}{2}\left( \frac{1}{2}m{{\upsilon }^{2}} \right)\times \frac{1}{4.2}\] \[\,\Delta t=\frac{1\times 50\times 50}{0.2\times 4\times 4.2\times 0.105\times {{10}^{3}}}={{7.1}^{o}}C\]
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