In this question, a statement of assertion is followed by …

Physics System of Particles Rotational Motion Assertion & Reason MCQ (Single Correct)

In this question, a statement of assertion is followed by a statement of reason . Mark the correct choice as:

Assertion: The center of mass of an isolated system has a constant velocity.
Reason: If center of mass of an isolated system is already at rest, it remains at rest.

If both assertion and reason are true and reason is the correct explanation of assertion.

If both assertion and reason are true but reason is not the correct explanation of assertion.

If assertion is true but reason is false.

If assertion is false but reason is true.

Text Solution

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The correct answer is:

: If is the total mass of the system concentrated at the center of mass, whose position vector

is , then from Newton's second law of motion,

But, velocity of centre of mass of system.
. For an isolated system, no external force is acting and the internal forces cancel out in pairs.

Therefore, total force .

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