Which one will produce a change in momentum? a) A car is driving down the road and the driver applies the brakes b) A quarterback dodges a tackle from the defense by changing his direction as he runs (a "juke") c) As you approach the finish line, you start running harder and speeding up d) A rocket is launching into space and losing rocket fuel as it shoots upwards d) All of the above

the box does not move because you need to use a force greater than 300 n. you are only using 50 n. it needs to at least be 301 n for the box to move because then it is an unbalanced force and it will move the way that the greater force is pushing it. if you use only 300 n it will be a balanced force and will not move because the force you are exerting on the   box is the same as its force.

hope this !

im sorry if i went too in depth, i am going to include a link to a video on khan academy that will explain this.   hope that you like the video and that it explains more in detail to you.

that is the link.