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Asun-sized star will spend most of its lifetime as a: white dwarf red giant protostar main-sequence star

Which of the following situations is impossible? a) an object has velocity directed east and acceleration directed east. b) an object has zero velocity but non-zero acceleration. c) an object has constant non-zero velocity and changing acceleration. d) an object has velocity directed east and acceleration directed west. e) an object has constant non-zero acceleration and changing velocity.

The energy produced as a result of this flow of electrons from atom to atom is called