A particle moves with a constant velocity parallel to the X-axis. Its angular momentum with respect to the origin ____________.

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remains constant For angular momentum, we have \overrightarrow{L} = m\left( \overrightarrow{r} $\times$ \overrightarrow{v} \right) \overrightarrow{v} = v \hat i\text{ and }\overrightarrow{r} = x \hat i + y \hat j So,\overrightarrow{L} = - mvy \hat k m, v and y are constant; therefore, angular momentum remains constant.

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