Question

A mass $m$ is moving with constant velocity parallel to the $x$ axis. Its angular momentum w.r.t the origin

• A. Is zero
• B. Remains constant
• C. Goes on increasing
• D. Goes on decreasing

Answer 1

The correct option is B Remains constant

Consider a particle $P$ moving parallel to X-axis.

Its angular momentum with respect to origin.

$L=\overrightarrow{r}\times \left(m\overrightarrow{v}\right)=m{r}_1\cdot v$

All variables $m,v$ and $r_1$ do not change.

$\therefore L=constant$