Aparticle of mass m moves with a constant speed v along the dashed line y =a. when the x-coordinate of the particle is x0, the magnitude of the angular momentum of the particle with respect to the origin of the system is

Scientists follow specific processes in order to determine valid explanations and conclusions from observations. david observed strange lights in the sky above his home outside of roswell, new mexico. the only explanation that makes sense to him is that there are ufos in the area. what should david do next to verify his explanation?