A rubber-wheeled 50 kg cart rolls down a 60 degree concrete incline. Coefficient of rolling friction between rubber and concrete is μr = 0.02. A) What is the cart's acceleration if rolling friction is neglected?
B) What is the cart's acceleration if rolling friction is included?

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 components of a vector are the parts of the vectors that are to each other.

b perpendicular

the ima (higher than 1m) will be greater than the ima with the height of 1m.