Which quantity can never be negative in one-dimensional motion?
Path length
Displacement is a vector quantity representing the shortest straight-line distance between the initial and final positions, and it can be positive, negative or zero depending on direction.
Velocity is also a vector quantity and can be negative when motion occurs in the direction taken as negative.
Path length, however, is the total distance actually travelled by an object along its path and is a scalar quantity that only adds up, so it can never decrease or become negative.
Hence, path length is the quantity that can never be negative in one-dimensional motion.
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