A person jogs 40 km in 32 minutes then 20 km in 22 minutes and finally 10 km in 16 minutes
what is his average speed in in per minute

1 kilometer per minute

Explanation:

All you have to do is add up all the kilometers divide that by the total of minutes.

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.