City b is northwest of city a and the 400 mile trip by car takes 8 hours. city b is exactly 320 miles nw of city a if able to travel in a straight line. what is the velocity of the car?

Complete these sentences. if a roller coaster train has a potential energy of 1,500 j and a kinetic energy of 500 j as it starts to travel downhill, its total energy isj. once the roller coaster train gets closer to the bottom of the hill, its kinetic energy increases to 1,100 j, and its potential energy decreases to j. when the train reaches the bottom of the track and is traveling along the ground, its kinetic energy isj.