MediumPhysics
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-- Given below are two statements: One is labelled as Assertion (A) and the other is labelled as Reason (R).Assertion (A): Even if the net external force acting a body is zero, its linear momentum may not necessarily be conserved.Reason (R): The internal forces between the particles of a body can change the linear momentum of the body.
A
Both (A) and (R) are true and (R) is the correct explanation of (A).
B
Both (A) and (R) are true but (R) is not the correct explanation of (A).
C
(A) is false but (R) is true
D
Both (A) and (R) are false
Explanation
Assertion is false because if F_ext = 0, dp/dt = 0, so linear momentum MUST be conserved. Reason is false because internal forces can only change individual particle momenta, not the total linear momentum of the system.
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