An asteroid that is 1200 kg is going towards earth at 300m/s. In a window of 0.75 seconds we want to slow it to 50m/s by sending a rubber ball at it. How much force does the rubber ball need to slow the asteroid down?

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.

answer: 31, 5556. 952 seconds