A tractor T is pulling a trailer M with a constant acceleration. If the forward acceleration is 0.50 m/s2 and M = 400 kg and T = 500 kg, then the horizontal force on the tractor due to the ground is (ignore air resistance)
A) 450 N forward.
B) 450 N backward.
C) 250 N forward.
D) 250 N backward.
E) 200 N forward.
Correct Answer:
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