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Centrifugal force is an inertial force when considered by:

1. An observer at the centre of circular motion
2. An outside observer
3. An observer who is moving with the particle and experiencing the force
4. None of the above

Correct answer: An observer who is moving with the particle and experiencing the force

Solution

Centrifugal force is not a real force in an inertial frame; it appears only in a non-inertial rotating frame. An observer moving with the particle in the rotating frame treats it as an inertial force.

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