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Which of the following retain their relative positions even when they move under the action of an external force?

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Which of the following retain their relative positions even when they move under the action of an external force?

(a) Rotation body

(b) Stationary body

(c) Rigid body

(d) A body in equilibrium

The question was asked in examination.

Enquiry is from Forces and Inertia in portion Gravitation of Engineering Physics I

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Right option is (c) Rigid body

Easiest explanation: A body is said to be rigid if it does not undergo any change in its size and shape, however large the external force may be acting on it. A rigid body is one whose constituent particles retain their relative positions even when they move under the action of an external force.

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