The distance from the sun to earth would be

a. less than one light year
b. more than one light year
c. exactly one light year
d. any number of light years

distance between sun and earth is 1 AU

now 1 light year is defined as distance covered by light in one year

so we will have

So 1 Ly is more than the distance between sun and earth

the force on the thing and the distance the force moves the thing

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.