Question

define radius vector in circular motion​

Answer 1

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The radius for circular motion is a vector. ... Notice that the radius vector is not constant. It does have a constant size; however, its direction changes as the object orbits.
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Answer 2

hi mate,

Circular Motion -

When an object moves in a circular path, its motion is called circular Motion.

Uniform circular motion - If an object moves in a circular path with uniform speed, its motion is called uniform circular motion.

The radius for circular motion is a vector. ... The radius extends from this origin to the position of the object.

i hope it helps you.