A Machine Gun Is Attached to a Railroad Flatcar That

question 24

Multiple Choice

A machine gun is attached to a railroad flatcar that rolls with negligible friction.If the railroad car has a mass of 6.25 × 10⁴ kg,how many bullets of mass 25 g would have to be fired at 250 m/s off the back to give the railroad car a forward velocity of 0.3 m/s?

• A) 400
• B) 2000
• C) 3000
• D) 5000

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