A roller coaster starts at a point 30 m above the bottom of a dip with a speed of 25 m/s. Neglect friction, what will be the speed of the rollercoaster at the top of the next slope, which is 45 m above the bottom of the dip

This is important 1. what happens to the speed of molecules in water vapor when it condenses to form a liquid? (2 points) the molecules slow down. the molecules speed up. the molecules slow down and then speed up. the molecules speed up and then slow down. 2. how might human activities change to compensate for a decrease in water supplies? (2 points) humans might build a factory. humans might build drainage systems. humans might extract more water from the ground. human behavior does not change because of the water cycle. i'll be grateful if anyone can answer these 2 questions !

Which of the following is not a transverse wave? a) soundb) lightc) radiod) all of thesee) none of these

For waves in the ocean, the medium of the waves is a. air b. water c. energy d. a passing boat