A pedestrian is in the middle of the road, standing still at point o. A bus of mass m is approaching him with a constant velocity u, as shown in the figure below. Considering the bus as a particle, find the angular momentum of it about the point o.

• A. The magnitude of the angular momentum is $\left\vert\overrightarrow{L}\right\vert=sm\left\vert\overrightarrow{u}\right\vert$The direction of the angular momentum is into the plane of the screen.
• B. The magnitude of the angular momentum is $\left\vert\overrightarrow{L}\right\vert=sm\left\vert\overrightarrow{u}\right\vert$The direction of the angular momentum is out of the plane of the screen.
• C. The magnitude of the angular momentum is $\overrightarrow{L}=\frac{sm}{\left\vert\overrightarrow{u}\right\vert}$The direction of the angular momentum is into the plane of the screen.
• D. The angular momentum is zero.

Answer: (D)