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An object can move in different ways. It can speed up, slow down, go round and round, or move in random directions.

Mathematically, the simplest of all these is when an object moves in a straight line. A line is a one-dimensional object. So, this motion is called one-dimensional motion.
Which of these is an example of motion along one single line?

Movement 1

Movement 2

Movement 3

Movement 4