A Tractor $\mathrm{T}$ Is Pulling a Trailer $\mathrm{M}$ With a Constant Acceleration $1.5 \mathrm{~m} / \mathrm{s}^{2}$

Multiple Choice

A tractor $\mathrm{T}$ is pulling a trailer $\mathrm{M}$ with a constant acceleration. If the forward acceleration is $1.5 \mathrm{~m} / \mathrm{s}^{2}$ and $\mathrm{M}=$ $400 \mathrm{~kg}$ and $\mathrm{T}=500 \mathrm{~kg}$ , then the force on the tractor due to the trailer is (ignore air resistance)

A) $35 \mathrm{~N}$ forward.
B) $600 \mathrm{~N}$ backward.
C) $450 \mathrm{~N}$ backward.
D) 0 .
E) $200 \mathrm{~N}$ forward.