Your kid sister is making a mobile representing the earth, moon, and sun for her grade school science fair. the ruler is provided below to you determine positions of the three hanging balls, of mass 15g, 5g, and 30g, respectively. of the five options provided, where would you connect a string to this mobile so that it would remain balanced when you hung it from the string? (the rods and strings all have negligible mass compared to the balls). explain.

Is a  vector quantity  that refers to "the rate at which an object changes its position." imagine a person moving rapidly - one step forward and one step back - always returning to the original starting position. while this might result in a frenzy of activity, it would result in a zero velocity. because the person always returns to the original position, the motion would never result in a change in position. since velocity is defined as the rate at which the position changes, this motion results in zero velocity. if a person in motion wishes to maximize their velocity, then that person must make every effort to maximize the amount that they are displaced from their original position. every step must go into moving that person further from where he or she started. for certain, the person should never change directions and begin to return to the starting position.