90% Students Wrong! Most Repeated NEET Physics PYQ | Collision Trick | Live Online Class

追加: 2026-06-05

[00:00:02]Now, let's apply conservation of momentum here.

[00:00:05]>> So, the total momentum never changes?

[00:00:07]>> Exactly. [music] It remains completely conserved.

[00:00:37]>> First of all, what is the given data?

[00:00:38]Given data is first mass and uh What is this?

[00:00:42]>> Three.

[00:00:42]>> The question is the first mass is >> Second law.

[00:00:44]>> Uh first of all the first of all mass is M, right?

[00:00:46]>> Oh.

[00:00:47]>> Yeah, first M is U1 is uh V.

[00:00:50]Uh mass into >> Three.

[00:00:51]>> Three M, right?

[00:00:53]Uh what about U2? U2 is the second body at rest, zero.

[00:00:57]Common velocity So, the formula is common velocity formula V equals common velocity formula >> M1 >> U1 plus M2 >> Wait.

[00:01:06]>> U2 >> Right. M plus M1 plus M2.

[00:01:08]>> M1 plus M2.

[00:01:12]So, M1 is uh M1 is uh M, right?

[00:01:15]Like that.

[00:01:16]>> M.

[00:01:16]>> M.

[00:01:17]>> M.

[00:01:17]>> M1 is M, U1 is V.

[00:01:19]>> V.

[00:01:19]>> Plus M2 is zero, right?

[00:01:21]>> Oh.

[00:01:21]>> Rest of them are zero.

[00:01:22]>> M2, sir.

[00:01:23]>> M2 what is U2 zero, right?

[00:01:24]>> Oh, sir.

[00:01:25]>> M2 is zero, right? So, M1 is M. M2 is four M.

[00:01:28]Four M is uh Three M. Yeah, this is M plus three M is four M.

[00:01:31]>> M V plus >> M V plus zero is four >> Four M.

[00:01:33]>> So, M and M cancel out. Finally, the final common velocity V equals to M into V by four. So, it will be V by