Until a train is a safe distance from the station, it must travel at 5 m/s. once the train is on open track, it can speed
up to 45 ms. if it takes a train 8 seconds to reach 45 m/s, what is the acceleration of the train

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 !

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

During a car accident, a 125kg driver is moving at 31m/s and in 1.5s is brought to rest by an inflating air bag. what is the magnitude of the change in momentum to the driver