If you know source reason why Newton's third law of motion works, then you can manipulate that source diagram to figure out how to stop motion of one body of equal mass. But theory needs proof. So instead of theory, I am directly posting link of my youtube video.

 

<Link removed>

 

You can watch other videos also posted on the same channel. Please tell me what mistake I am doing.

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Moderator Note

Hello and welcome to the forum.

I have removed the link to your video as it violates the rules you agreed to when you signed up.

Members should be able to participate without watching videos or leaving the site.

Also as a new member it helps us reduce spammers including people just trying to drive up their views.

Please post enough information to get a discussion​ started.