A bobsled has a momentum of 4000 0 kg * m/s to the south. Friction on the track reduces its momentum to 500 kg * m/s to the south. What impulse is applied to the bobsled by the friction?
A. 6500 kg * m/s north
OB. 1500 kg * m/s south O
C. 6500 kg * m/s south
O 1500 kg * m/s north
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