A ball with mass m and velocity v hits a wall, and suffers an elastic colision. So it comes back vith velocity -v (1 dimension motion).
Since linear momentum must be conserved, it means the wall has a momentum p=2mv after the ball comes back. How can we prove it?
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Was it? hahaha
I guess that is fine, since linear momentum must be conserved. But it was a question by professor Walter Lewin, in 8.01 (MIT Physics), that he wanted his students to think about.
I gonna watch it again and see if that was what he was asking for...
At the moment it seemed as a brain teaser.
Anyway, thanks haha. The question is really silly...
So, i guess the question is 'how can the wall have momentum and yet no kinect energy (since m=infinity and thus v=0)?" - an ideal case
What is the meaning of this?
I haven't seen the video, but I think the important fact here is that whereas momentum varies in v, kinetic energy varies in v².
If mass of wall M is much greater than mass of ball m, then MV will be finite, whereas MV²/2 will be infinitesimal.
momentum is conserved if no external force is applied on the system.in this case i believe an external force is present