Edexcel M4 Exam Discussion Thread [June 5th]

So can i Assume that 68/75 will be an 90UMS ?

I got π/3. If someone posts the paper I can do model answers

I heard your parents took you to a freak show and got invited on stage

Funnily enough when I saw your mum the other night she said the same thing, not about the post of course but something else
She was also quite thick

I can see the genes being passed on

But don't worry half of your brother in 9 months time's genes would be much better

How do you know it'll be a boy?

Funnily enough when I saw your mum the other night she said the same thing, not about the post of course but something else
She was also quite thick

I can see the genes being passed on

But don't worry half of your brother in 9 months time's genes would be much better

These are my quick attempts based of a sketchy memory of the paper and what I wrote. Be sure to tell me if I've made a mistake.

Edit:cos(2t) should be -0.5 and t=pi/3.

I think you copied the second order DE down wrong, it should be x=....+sin(2t)*(1/6), resulting in D=-1/12

Yeah a negative D sounds right. I don't have a copy of the paper with me so I wouldn't be surprised if I made mistakes copying stuff down.

I think I got the direction wrong for Q2.

If the question asked for the direction 'from' ( I probably misread the question) then it's a bearing of 180+76=256.

I look to have got most of it right but I am not sure about the bearing shouldn't it be 90-arctan(4/16) people on here are saying its 180 degrees since it asked where the wind acts from but wasn't your Vw=16i+4j the velocity the wind is acting from anyway so you shouldn't have had to add 180 it was acting from North and then from (16i+12j I think) so its got to act from around those angles I am not really sure about this though as direction and magnitudes are very confusing when it comes to relative motion.

The stability question they asked was very hard but I had seen it on a past paper a few days ago so I just copied down the same method with different numbers and even then that took me a while in the exam and there is no way I would have got that right in time if I hadn't done it before as it took me ages the first time.People on here seem to have used a better method than mine I did cosine rule and pythagoras with a circle theorem(angle in semicircle 90 degrees) to get the distances I needed).

The second order differential equation was a bit unusual and I hadn't seen it before I did it by splitting up the string into two strings and consider the extensions in both, for the last part using the adding trig to multiple of trig formulas was the easiest way I think and then simply solving both and selecting the shortest time.The coefficient of restitution(last question) was a bit sneaky in that you need w in terms of u and to do that you had to mess on with the addition formulas for 60-beta so that your answers were exact.

Overall I think it was an average/maybe slightly hard paper it was certainly harder than the paper which was 65 for an A(that paper was really easy you had to simply do basic conservation of momentum no M4 needed and sub relative velocities into formulas and solve a basic SHM problem) I think probably high 50s for an A around 58-60(with A* probably around 65-67) as the boundaries for M4 are usually pretty low.I

what was everyone getting if you wrote the direction if the wind as a bearing?


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