A mass $M$ is moving with a constant velocity on a line parallel to the $x$-axis. Its angular momentum with respect to the origin or $z$-axis

• A

  is zero
• Correct answer
  B

  remains constant
• C

  goes on increasing
• D

  goes on decreasing

Solution

Angular momentum of particle w.r.t. origin
$=$ linear momentum $\times$ perpendicular distance of line of action of linear momentum from origin $=m v \times a=m v a=$ constant

Hence, the correct answer is option: 'B'.