Simple past vs past continuous

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?

How many speedboats are there in the avakin life's paradise island social spot?

Theodore is writing a blog post on the relationship between music and a person’s mood. which of the following sentences might appear in his conclusion? a. do you have a particular song that always makes you feel better? b. a recent study shows that music can enhance a good mood and relieve a bad mood. c. whatever the reason, it is clear that music is deeply connected to human emotions. d. the researchers found that the type of music was less important than how much the subject enjoyed it.