Assuming $m ≪ M$ , find the fraction of the bullet's initial kinetic energy that turned into heat.

η = \frac{M}{m + M}

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η \approx 1 - \frac{3 m}{M}

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η \approx 1 - \frac{2 m}{M}

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η = \frac{m}{m + M}

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Solution

The correct option is A $η = \frac{M}{m + M}$

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