When you have two unlike charges in a line – where is the electric field the greatest? Is there ever a point where the field will be zero?

-Electric field will be the greatest at the point where it is closest to it's charges.

- No, there cannot be a point where the field will be zero

Explanation:

Usually, in field lines and vectors, the principle is that: Where the field lines are in a close manner together, the field will be strongest. However, where the field lines are in a manner far apart, the field will be the weakest.

Applying that to our question now it means that the electric field will be the greatest at the point where it is closest to it's charges.

In unlike charges, there can never be a field of zero in between the 2 opposite charges because the field vectors from both unlike charges will point towards the negative charge.

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.

the chart show the masses and velocities of two colliding objects that stick together after a collision.

according to the law of conservation of momentum, the momentum of the object after the collision is  

answer

1,500

kg • m/s.