Question

A particle is moving along a stright line parallel to x-axis with constant velocity. Does its angular momentum about the origin decrease with time or increase with time or remain constant ?

Answer 1

Answer:

a particle is moving along a straight line parellel to x -axis .

hence position vector ( r^ ) = b j^

mass of body = m

velocity of body V^ = v i^

we know ,

angular momentum = m ( r^ x V^)

=m ( b j^ x v I^)

= -mbv k^

hence ,

option (2) is correct .

note :- I x j = k

so, j x i = - k

Explanation:

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