Traveled.
No, traveled has 2 syllabels.
travelled
Traveled is a main verb; it does have a meaning of its own and doesn't need to be supported by another verb.
Yes, traveled is the past tense and past participle of travel.
Displacement means a measure of distance traveled.
The word "flew" (past tense for "to fly"). But the word "travelled" is also a correct variant of the word (traveled). The proper spelling for having been racing is "raced".
Orbit. It refers to the curved path that a planet follows as it moves around the sun.
Traveled.
traveled
(2)-Trav-uhl.
Had traveled = had + past participleI had traveled to China many times before.