In what situation might average speed be a better measure of motion than average velocity?

Which sound characteristic is not affected by the relative motion of an object

You want to lose weight and have been trying to decide which type of fad diet is best for you. you ask your doctor, who responds that a. fad diets are a temporary fix but generally don't have any side effects b. fad diets can be used several times a year to maintain a healthy weight c. fad diets can be risky for your health and, in the long run, do not work d. fad diets should never be used one right after the other; there should be a break between them select the best answer from the choices provided. a b c d

If anyonee has done the momentum lab practical in physics can you give me the answers i am s lostt rnn : (