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  4. If two balls of same metal weighing 5 gm and 10 gm strike with a target with the same velocity. The heat energy so developed is used for raising their temperature alone, then the temperature will be higher

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Q. If two balls of same metal weighing $5\, gm$ and $10\, gm$ strike with a target with the same velocity. The heat energy so developed is used for raising their temperature alone, then the temperature will be higher

Thermal Properties of Matter

Solution:

Energy $=\frac{1}{2} m v^{2}=m c \Delta \theta ;$
$\Rightarrow \Delta \theta \propto v^{2}$
Temperature does not depend upon the mass of the balls.