A tractor T is pulling a trailer M with a constant velocity. If the velocity is 20 m/s and M = 200 kg and T = 500 kg, then the force on the trailer due to the tractor is
A. 600 N forward.
B. 450 N backward.
C. 200 N backward.
D. 35 N forward.
E. 0.
E. 0.
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