Design a roller coaster.

i need with the questions on this page.

and also questions:
1. why does the first hill have to be the highest?
2. why can't the next hill of the roller coaster be as high as the first?
3. what forces slows it down?
4. the kinetic energy is change to what kind of energy by this force?
5. what is the approximate percentage of gpe/ke at different points on your roller coaster labeled a, b,c?

When many atoms are split in a chain reaction, a large explosion occurs. this is an example of what type of energy conservation

Tafari worked one summer on a ship that set weather buoys in the ocean. he watched how one of the buoys moved in the water. describe which parts of the wave would cause the buoy to bob up and down. which wave property determined how fast the buoys bobbed in the water? he observed that when the wind blew harder, the ocean waves were larger, and the buoys moved away from the ship. what effect, if any, did the waves have on how far the buoys moved? explain your answer.

When using the scientist method, which step comes last?