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A rifle bullet with a mass of 16.5 g traveling toward the right at 285 m/s strikes a large bag of sand and penetrates it to a depth of 22.6 cm. Determine the magnitude and direction of the friction force (assumed constant) that acts on the bullet.

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    initial momentum = .0165 * 285
    change of momentum = -.0165*285

    average speed during stop = 285/2

    time to stop = .226/average speed during stop

    Force = change in momentum / time to stop

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