Assertion: A body,whatever its motion, is always at rest in a frame of reference which is fixed to the body itself.
Reason: The relative velocity of a body with respect to itself is zero.

Options

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

Answer

A

Explanation

A body has no relative motion with respect to itself. Hence if a frame of reference of the body is fixed, then the bodies will be always at relatively rest in this frame of reference. So 'a' is correct.