OCR MEI Maths: Paper 1, Unofficial mark scheme

Reply 180

leowaddington08

4

Original post by C342

? i got d as -600 not 530

I got -600 as well, hence used 16 for n

Reply 181

lionike123

15

Yh it was -600. I double checked my answer as well by subbing it back in.

Reply 182

Crowski144

4

Original post by ahhmed123

How, it was a tan curve, not a sine curve. There was only one solution

it was squared so you have have +/- the value which if u added pi to the negative one you get 5/6pi. It implied there was more than one in the question

Reply 183

Fahad_Saleem

1

Original post by Bowdenpink

I got coefficient of fricton to be 0.221

Yeah same my guy

Reply 184

Crowski144

4

nah its 16 mate. it was 16/2((2x9300)-(15x600))

Original post by RIpp0

N is not 16 it's 17, it would be 16 if you've written your sequence like in GCSE. The sequence was In= 9300 - 530(n-1) and when n=17 the sequence is still positive

Reply 185

CianBlake

5

It was in degrees, 20 or 25 degree incline

Original post by SaleemOm

Saw people saying it was in radians. I can’t really remember but wasn’t the question in degrees?

Reply 186

12aroberts

6

could someone please go over the differential equation question and tell me where i went wrong i got v=square root of (19.6x/k)

Reply 187

12aroberts

6

to find the maximum value did anyone else find the maximum point and differentiate?

Original post by leowaddington08

I got -600 as well, hence used 16 for n

Reply 188

username4648528

6

Original post by 12aroberts

to find the maximum value did anyone else find the maximum point and differentiate?

Surely this would end up with a non-integer value of n

Reply 189

lionike123

15

It said the greatest, not maximum hence we only had to differentiated it once.

Original post by 12aroberts

to find the maximum value did anyone else find the maximum point and differentiate?

Reply 190

MysteryVader

11

Yeah I found the sum in terms of n and differentiated. You get a quadratic with a negative coefficient so it has to be a maximum. Luckily also, value that you get is a whole number.

Original post by 12aroberts

to find the maximum value did anyone else find the maximum point and differentiate?

Reply 191

honeydukes01

15

Original post by Aoan

yes, head of maths at my school is in contact with them over the issue

Original post by dylan5963

Mine probably is too. She was furious

Yes, my maths department has emailed in too

Reply 192

Charlottie1356

5

That’s what I got

Original post by Dr..D

yes I remember getting this acceleration yes

Reply 193

Callum130701

2

Exactly the same

Original post by Clark1111

Yeah same the RcosX one, what did everyone get as the transformation, I got a stretch in y-direction scale factor 1/root53 and -0.2... translation in the x-direction

Reply 194

MMFM411

9

Did anyone else use an integrating factor for the differential equation, or was it just me??

Reply 195

dduke

3

I remember getting something like 0.2... for the coefficient of friction

Reply 196

AIR127

10

I got 0.317, but it seems that a lot more people agree on that 0.5... answer

Reply 197

AIR127

10

Anyone care to share what they got on the paper - I reckon I got something between 55-70, though most likely towards the lower end.

Reply 198

YasminLE

4

Maybe 50-65 if I’m lucky

Original post by AIR127

Anyone care to share what they got on the paper - I reckon I got something between 55-70, though most likely towards the lower end.

Reply 199

dduke

3

what did you use as the integrating factor? It might have worked, I don't think it was necessary though. I think it ended up as something along the lines of V=U+AT, which is a suvat equation.

Original post by MMFM411

Did anyone else use an integrating factor for the differential equation, or was it just me??

OCR MEI Maths: Paper 1, Unofficial mark scheme

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