What is the resistance of 100 cm copper if it's cross-sectional area is 3.14 X 10-⁶ m²? (Specific copper is 1.69 X 10-⁸ ohm-m) A. 5.4 X 10-⁶ ohm
B. 4.5 X 10-⁶ ohm
C. 5.4 X 10-³ ohm
D. 4.5 X 10-³ ohm

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.

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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.

god i hope this !