Which observation have scientists used to support Einstein's general theory of relativity?
SERE
The orbital path of Mercury around the Sun has changed.
GPS clocks function at the same rate on both Earth and in space.
The Sun has gotten more massive over time.
Objects act differently in a gravity field than in an accelerating reference frame.

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.