Can someone help me answer this question please.

Select the word from the list that best fits the definition classification of most stars on the h-r diagram

Who was the first scientist to measure speed as distance over time?

14. a body is projected with velocity vi from a.at the same time another body is projectedvertically upwards from point b withvelocity v2 lies vertically below the highestpoint. both the bodies collide thenv2÷v1is