Areference point is the object to which we compare another objects motion. true or false?

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If the ama of the inclined plane below is 2, calculate the ima and efficiency. ima = efficiency =

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?