Of roller coaster car rapidly picks up speed as it rose down a slope as it starts down the slope, its speed is 4m/s . but 3 seconds later at the bar got bottom of the slope, is speed is 22m/s. what is its average acceleration?

Why do different substances have diffrent properties

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.

Which is a substance that can be separated by physical means and is not the same throughout