Question

what is rectilinear motion ​

Answer 1

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Linear motion, also called rectilinear motion, is one-dimensional motion along a straight line, and can therefore be described mathematically using only one spatial dimension.

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Answer 2

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Linear (rectilinear motion): When an object moves in a straight line, for example, a car moving on a straight road, and apple falling from a tree, or a bullet shot from a gun, it is said to be in linear or rectilinear motion.

Linear/rectilinear motion is a kind of translatory motion.