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In a ballistics demonstration a police o...

In a ballistics demonstration a police officer fires a bullet of mass `50.0` with speed `200 ms^(-1)` on soft plywood of thickness `2.00` cm . The bullet emerges with only 10 % of its initial kinetic energy. What is the emergent speed of the bullet ?

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`v_(f) = 94.87 ms^(-1)`
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