Which is less likely to be a reliable source of information, the webpage of a university or the webpage of a scientist who is trying to sell a new invention? provide evidence to support your claim, and explain your reasoning.

Aregion of space in which a measurable gravitational force is indicated by the force exerted on a test mass is called

Iwill give brainliest if you answer right : )

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.