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A bullet leaving a rifle with a muzzle velocity of 1000m/sec strikes the earth

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A bullet leaving a rifle with a muzzle velocity of 1000m/sec strikes the earth at the same level with a velocity of 500m/sec. What is the work done in overcoming the resistance of air if the mass of the bullet is 10g? 

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Answer: A ≅ 380 kg-m.

Explanation:

The work done against the air resistance is equal to the loss in the kinetic energy of the bullet:

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