In the Figure, an Airport Luggage Carrying Train with a Tractor

Multiple Choice

In the figure, an airport luggage carrying train with a tractor $T$ is pulling three luggage carts, $M_{1}, M_{2}$ , and $M_{3}$ , with constant velocity of $4.5 \mathrm{~m} / \mathrm{s}$ . If $T=300 \mathrm{~kg}, M_{1}=200 \mathrm{~kg}, M_{2}=100 \mathrm{~kg}$ , and $M_{3}=100 \mathrm{~kg}$ (there is no friction) , then the force in the connection between the tractor $\mathrm{T}$ and cart $\mathrm{M}_{1}$ is

A) $280 \mathrm{~N}$ .
B) $560 \mathrm{~N}$ .
C) $980 \mathrm{~N}$ .
D) $0.00 \mathrm{~N}$ .
E) $140 \mathrm{~N}$ .