Toy train engine rests motionless on a track. One student begins pushing the engine to the right with a force of 2 N. At the same time, another student begins pushing the engine to the left with a force of 5 N. Which of the following best describes the resulting? A. It travels left at a constant speed.
B. It travels left at an increasing speed.
C. It travels right at a constant speed,
D. It travels right at an increasing speed.