What happens to the frequency if the period were to change from o.2 seconds to 0.5 seconds

Johnny rode his bike to a friend's house 4 blocks down the street in his neighborhood. he immediately rode back home once he realized his friend was not able to play. what was his displacement for the total bike ride? how did you determine this? what could we use as a reference point to determine he was in motion during his bike ride? why can you use it as a reference point

Which statement best describes the role of religion and culture in ancient medicine?

Which could be a pathway of food through an ecosystem