A fire fighting vehicle of mass 12,000 kg is at rest but free to roll with no resistance. If you push it forward with a force of 500 N, the momentum at the end of 10 s of pushing will be
A. 5000 kg m/s.
B. zero.
C. 20,000 kg N/s.
D. 0.416 m/s.
Answer: A
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