A small object is placed at right angles to the axis of a fixed concave mirror so as to form i) real ii) a virtual image twice as long as the object It the radius of curvature is 40cm what is the
distance between the two images?​ (number 4)
​

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.

um if your asking how to beat a level then that i can with that and how to fix your wii but other than that i can't u