Assertion : A particle is moving on a straight line with a uniform velocity, its angular momentum is always zero.
Reason : The momentum is zero when particle moves with a uniform velocity

Options

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

Answer

D

Explanation

When particle moves with constant velocity `vecv` then its linear momentum has some finite value `(vecP=mvecv)`
Angular momentum (L)= Linear momentum `(P)xx` Perpendicular distance of line of action of linear momentum form the point of rotation (d)
So if `d ne 0` then `L ne 0`, but if `d=0` then L may be zero. So we can conclude that angular momentum of a particle moving with constant velocity is not always zero.