A tractor T is pulling two trailers, 
and 
with a constant acceleration. T has a mass of 200 kg, 
has a mass of 100 kg, and 
has a mass of 150 kg. If the forward acceleration is 0.60 
then the horizontal force on the tractor due to the ground is
A. 270 N backward.
B. 270 N forward.
C. 150 N backward.
D. 150 N forward.
E. 90 N forward.
B. 270 N forward.
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