A roller coaster starts from rest at the top of a 90 m hill. How fast will it be going at the
bottom of the hill, if there is no friction? Use Conservation of Energy GPE = KE to solve

give me sec wai give me sec

this allows people to make the best decision or pursue the best option. when alternatives are weighed using their advantages and disadvantages, the option whose disadvantages outweigh the advantages (based on a qualitative or quantitative analysis) are shunned while those whose advantages outweigh their disadvantages are pursued.  

speed

ratio of distance traveled to time interval

net force

vector sum of forces on object

object

source of diverging light rays either luminous or illuminated

don't remove my answer im trying my best to answer them

explanation: