A bullet leaving the muzzle of a rifle barrel with velocity v penetrates a plank and loses one-fifth of its velocity. It then strikes second plank

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A bullet leaving the muzzle of a rifle barrel with velocity v penetrates a plank and loses one-fifth of its velocity. It then strikes second plank, which it just penetrates through.
30
Aug
A bullet leaving the muzzle of a rifle barrel with velocity v penetrates a plank and loses one-fifth of its velocity. It then strikes second plank, which it just penetrates through. A bullet leaving the muzzle of a rifle barrel with velocity v penetrates a plank and loses one-fifth of its velocity. It then strikes [...]
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