Physics Question?

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A machine gun is attached to a railroad flat car that rolls with negligible friction. If the railroad car has a mass of 6.25 X 10 to the 4th power kg, how many bullets of mass .025 kg would have to be fired at 250 m/s off the back to give the railroad car a foward velocity of .5 m/s?
A. 400
b 2000
c 3000
d 5000

2007-11-20 14:41:04 · 1 answers · asked by S.I.N 4 in Science & Mathematics ➔ Physics

1 answers

conservation of momentum
62500 x .5= .025 x 250 x number

2007-11-20 18:18:15 · answer #1 · answered by meg 7 · 0⤊ 0⤋