If dede's car goes from 0m/s to 8 m/s in 1 sec. what is her acceleration

a = 8ms⁻¹ - 0ms⁻¹  / 1s

a = 8ms⁻¹ / 1 s

a = 8ms⁻² .

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.

higher potential

explanation:

because it is in a high speed so it must move into a of high potential