This question gives you free points but you got to help me on my other question I will post in chat when I post my other question

Atrain departs from its station at a constant acceleration of 5 m/s. what is the speed of the train at the end of 20s?

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

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.