POSSIBLE POINTS: A box weighing 600 N is pushed horizontally with a force of 200 N across a surface. The force of sliding friction is 50 N. What is the magnitude of the net
force on the box?
400
850 N
550N
150N

3is a crest4 is a trough 2 is the amplitude 1 is the wavelength

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 objects are acted upon by only one force. gravity. mass times the acceleration of gravity (-9.81meters/second squared).