The prepositions 'upon' & 'onto' have a slight difference. 'Upon' indicates 'position at a higher level'; 'onto‘ indicates ‘movement to a higher position‘. Therefore, the sentence "The cat jumped onto the table" is okay. Because it indicates a movement to a higher position. The sentence, "The cat slept upon the table" is also okay because it indicates rest or position at a higher level, not movement. But my friend tells me that we can also say "The cat jumped upon the table".
Can we use ‘upon‘ & ‘onto‘ interchangeably to indicate MOTION?