A machine gun is attached to a railroad flatcar that rolls with negligible friction. If the railroad car has a mass of 6.35 × 10^4 kg, how many bullets of mass 35.0 g would have to be fired at 200 m/s off the back to give the railroad car a forward velocity of 0.56 m/s?

a. 5.1E–4
b. 2.0E+3
c. 6.5E+5
d. 5.1E+3
e. 6.5E+4


d

Physics & Space Science

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