Kamala puts on inline skates and stands facing a wall. when she pushes against the wall, she rolls backward. why does pushing harder make her roll faster?

As per Newton's III law every action has equal and opposite reaction.

Explanation:

When Kamala apply force on the wall then equal and opposite force is applied by the wall on Kamala

Due to this reaction force of the wall Kamala moves on her skates in backward direction

Now if Kamala push the wall hard then the reaction force on kamala will be more in magnitude due to which she will roll backward will greater speed as we know that

F = ma

if the reaction force is more then the acceleration will be more so Kamala will roll backward with greater speed

number of electrons for neutral cl

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.