Afootball coach sits on a sled while two of his players build their strength by dragging the sled across the field with ropes. the friction fource on the sled is 1000n and the angle between the two ropes is 20°. how hard must each player pull to drag the coach at a steady 2.0m/s?

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.

That would be kinetic energy