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# A particle of mass m starts from origin with constant velocity $u \hat i$. Its angular momentum about the origin is

$\begin {array} {1 1} (a)\;zero & \quad (b)\;mru \hat j \\ (c)\;mru \hat k & \quad (d)\;mru \hat i \end {array}$

$\overrightarrow {L}= \overrightarrow {r} \times \overrightarrow {p}$
$\bar {r} \parallel \overrightarrow {p}$
$L=0$
edited Jun 21, 2014