An olympic runner completes the 200-meter sprint in 23 seconds. what is the runner’s average speed? (round your answer to the nearest tenth of a meter per second.)

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?