Question

what is the direction of radius vector in angular acceleration​

Answer 1

where →a is the particle's acceleration vector, and →r is the vector from the axis of rotation to the particle. The direction of the angular acceleration is co-linear with the axis of rotation and the right-hand rule gives the rotational direction of the angular acceleration

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Answer 2

Answer:

Here's your answer my friend :)

Explanation:

The vector direction of the acceleration is perpendicular to the plane where the rotation takes place.

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THANK YOU.

@brutalguy :)