Identify the type of motion for train on a straight bridge

Explanation:

When a train moves on a straight bridge, it exhibits rectilinear motion, which means it moves along a straight line. This type of motion is characterized by an object traveling in a straight path without changing direction. In this case, the train's movement along the straight bridge aligns with the definition of rectilinear motion.

Other Options:

b) Periodic motion: This refers to motion that repeats at regular intervals, such as the swinging of a pendulum. The train's movement on a straight bridge does not repeat in a regular cycle, so it is not periodic motion.

c) Rotational motion: This involves an object rotating around an axis, like the spinning of a wheel. The train does not rotate around an axis while moving on the bridge, so it is not rotational motion.

d) Circular motion: This is motion along a circular path, such as a car turning around a curve. The train moves along a straight path, not a circular one, so it is not circular motion.

Therefore, the train's movement on a straight bridge is best described as rectilinear motion.