Suppose you are driving a car and your friend, who is with you in the car, tosses a softball up and down from her point of view. A second friend of yours stands on the street and sees you passing by and says, "you are testing projectile motion with the softball!" Your friend on the street claims that each of you measures a different value for the vertical component of the initial velocity of the softball. Do you agree with the statement?

I do not understand how to approach this question