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A rifle with a mass of 12 g, traveling with a speed of 425 m/s strikes a large wooden block, which it penetrates to a depth of 15 cm. determine the magnitude of the retarding force that acts on the bullet.

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workdone is done against bullet by block,Fd which equals its kinetic energy of bullet to stop it F*0.15=1/2*0.012*425^2 F=1083.75/0.15=7225N
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