Whitch statement is true about the law of conservation of energy an object released from a certain height above the ground

In the image, the arrow is pointing to a celestial object. which attribute disqualifies the object from being a planet?

What is magnetic flux? explain faraday's law of induction.

Aboxcar traveling at 12 m/s approaches a string of 5 identical boxcars sitting stationary on the track. the moving boxcar collides and links with the stationary cars and they all move off together along the track. what is the final speed of the cars immediately after the collision? (you may take the mass of each boxcar to be 18,537 kg.)