Suppose you have a massless beam that you’d like to balance. You are told to hang a 100 gram mass hanging 3 cm to the left of the fulcrum. How far away would we need to hang a 25 gram mass to the right of the fulcrum to achieve balance?

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.

The answer is a blackhole. hope this !

The force that opposes gravity for falling objects is  air resistance.  (d)