Un resorte ubicado sobre un riel de aluminio, se comprime30 cm mediante una fuerza de 250N. Se coloca junto al resorte una pequeña pieza de cobre de modo que salga disparada como un proyectil cuando se libere el resorte. ¿Qué velocidad adquiere la pieza cuando sale del extremo del riel?

most of them using statistics and defining how things are being measured

magnityde and direction

they should be similar or the same

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.