Una bala es disparada con una velocidad de 30 m/s, formando un ángulo de elevación de 30º, respecto a la horizontal. Calcule a) en cuanto
tiempo alcanza la bala su altura máxima? b)a los 3 s, que velocidad
vertical lleva? C) a los 3 s, a que altura se encuentra? D) cual es la
altura alcanzada? E) a que distancia cayó del punto de lanzamiento?

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Explanation:

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.