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Question

A mass m is moving with a constant velocity along a line parallel to the x-axis, away from the origin. Its angular momentum with respect to the origin

A
is zero
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B
remains constant
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C
goes on increasing
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D
goes on decreasing
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Solution

The correct option is B remains constant
Angular momentum is given by:
L=r×p
The direction of angular momentum is into the plane of paper and constant with time..
About point O, |LO|=m(OB)v
LO=mva=constant

445348_161989_ans_8b00c7e1d90d45b1b2e975362aff2590.png

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