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  4. Assertion: No real body is truly rigid. Reason: A rigid body is a body with a perfectly definite and unchanging- shape. The distances between different pairs of particles of such a body do not change.

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Q. Assertion : No real body is truly rigid.
Reason : A rigid body is a body with a perfectly definite and unchanging- shape. The distances between different pairs of particles of such a body do not change.

System of Particles and Rotational Motion

Solution:

It is evident from the second statement that no real body is truly rigid, since real bodies deform under the influence of forces. But in many situations the deformations are negligible.