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w14question paper 11 question 28 please explain

http://maxpapers.com/wp-content/uploads/2012/11/9702_w14_qp_11.pdf And question 10 also please.

http://maxpapers.com/wp-content/uploads/2012/11/9702_w14_qp_11.pdf question 9 please. Idk how to do these momentum questions. I'll be indebted to you if someone could explain how to tackle questions of this sort please.

http://maxpapers.com/wp-content/uploads/2012/11/9700_w14_qp_11.pdf MCQ 16 please explain.

Someone please help. MJ 2010 paper 22 question question 7 part b ii 2, question 4 part c, question 3 part c.

Point P and R are entirely out of phase with each other because they have a difference of pie or 180 degrees between them whereas Q and T have a difference of 0.75 wavelengths between them which is equal to 270.

Can someone explain ON 2010 variant 22 question 4 part a please?

Can anyone explain how to solve the last part of paper 3 question 1? For example part f of variant 34 M/J 2010.

Is the answer A because for an elastic collision relative speed of approach= relative speed of separation?

That surely makes sense but sadly you're not getting what I'm trying to say.

Are you sure about this? Post the paper link please?

I meant that the weight is balanced by some force first and only then the resultant force produces acceleration. I think you misinterpreted or maybe I didn't convey it properly. :p

Is that A?