(Item is a throwing star/shuriken) Anyone might know what year this was made in lol, hasn't been used much, and can someone please translate the Chinese writing on it as well. But I more so want to know the writing on it. (would be nice if the year was stated)

Atrajectory has an initial velocity of 1,000 meters per second, and 5 seconds later, it has a velocity of 500 meters per second. which is the acceleration of the trajectory?

Careful comparisons to others can you to develop your self-concept because a. comparisons you to see your strengths and weaknesses b. comparisons you to develop unrealistic expectations for yourself c. comparisons you to feel superior to others around you d. comparisons you to identify people to communicate withcareful comparisons to others can you to develop your self-concept because a. comparisons you to see your strengths and weaknesses b. comparisons you to develop unrealistic expectations for yourself c. comparisons you to feel superior to others around you d. comparisons you to identify people to communicate with

What does this mean what does this say is this korean