Assertion-Reason based question on kinetic energy of many particle systems and center of mass frame.

Assertion: Total kinetic energy of a system depends on the frame of reference.

Reason: Kinetic energy measured in the center of mass frame is minimum.

Solution:

The kinetic energy of a system changes when observed from different frames of reference, so the Assertion is correct.

In the center of mass frame, the translational kinetic energy becomes zero, therefore the kinetic energy is minimum. Hence the Reason is also correct.

The Reason correctly explains the Assertion.

Answer: Both Assertion and Reason are correct, and Reason is the correct explanation of Assertion.