Chemistry NEET Full Syllabus Mock Test 180 Question New Syllabus Mock Test - 8 PCB Single Correct MCQ
Published on: August 14, 2026

Assertion: If there are no external forces, the center of mass of a double star moves like a free particle.
Reason: If we go to the center of mass frame, then find that the two stars are moving in a circle about the center of mass, which is at rest.

A
If both assertion and reason are true and reason is correct explanation of assertion.
B
If both assertion and reason are true but reason is not is correct explanation of assertion.
C
If assertion is true but reason is false.
D
If both assertion and reason are false.

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Text Solution

Verified by Experts
The correct answer is:
B

In our frame of reference, the trajectories of the stars are a combination of
(i) Uniform motion in a straight line of the center of mass and
(ii) circular orbits of the stars about the center of mass.

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