A1000.-kilogram roller coaster goes down a hill that is 90. meters tall. its speed at the bottom is 40. m/s. a. what is the efficiency of the roller coaster? assume it starts from rest at the top of the hill., b. what do you think happens to the “lost” energy? ,c. use the concepts of energy and efficiency to explain why the first hill on a roller coaster is the tallest

ability to mate mark me brainliest

when atoms of different types of elements join together, they make molecules called compounds. water consists of compound molecules made up of 2 hydrogen atoms and 1 oxygen atom. this is why it's called h2o. water will always have 2 times the number of hydrogen atoms as oxygen atoms.

the answer is: reproductively

i think i spelled it wrong lol

anyways hope i

-lavira: )