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Very hard momentum question

How can I solve question b iii
I am not sure how to do this. Could someone give a worked procedure using the conservation of momentum and conservation of KE.

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I did find this youtuber's solution but he did not prove that the velocity of X is 0ms^-1 he only showed Y was 0 ms^-1 https://www.youtube.com/watch?v=nR0ytBm4v74 @38:56
(edited 5 years ago)
I did find this mark scheme useful but I don't understand why disc Y HAS to have a velocity of 0ms^-1 after the collision.

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net force on y is 0 so you know it won't accelerate from rest
Original post by haarithiop
net force on y is 0 so you know it won't accelerate from rest


Oh yeah thanks. Don't know how I didn't spot that!
Original post by splitter2017
Oh yeah thanks. Don't know how I didn't spot that!


I also missed that initially, instead I treated it as being two collisions; one between x and y and then one between y and z assuming the distance between them is very small (so there are two collisions).

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