Final answer:
The acceleration of the last car of the train, with the force of 8.0 N and mass of 4.5 kg, is 1.78 m/s². The correct answer can be determined using Newton's second law of motion.
Step-by-step explanation:
The student's question is about calculating the acceleration of a train car given its mass and the force applied to it. According to Newton's second law of motion, the force (F) acting on an object equals the mass (m) of the object times its acceleration (a). The formula is F = m × a. To find the acceleration, we rearrange the formula to a = F / m. Using the given values for the last car of the train, with a mass of 4.5 kg and a force of 8.0 N, we can calculate the acceleration as follows:
a = F / m = 8.0 N / 4.5 kg = 1.78 m/s²
Therefore, the acceleration of the train's last car is 1.78 m/s². As all the answer options provided by the student are identical (1.78 m/s²), any of them would be the correct choice.