# M1 past paper speed-time graphs

Watch
Announcements
#1
http://examsolutions.net/a-level-mat...uary/paper.php

See q2b and the corresponding mark scheme for this question part.

I did this

(1/2)(2)(8) + 8T + (1/2)[75-(T+5)](8)=500

20 + 8T + 4(70-T)=500

...

T=50s

The mark scheme used the trapezium method to get area, but I used a different method and still got the right answer. So do I get full marks still? Aren't the A2 methods there for the method which is right or what?

Also, for the same paper, see q6d. Would 3.97m (3SF) be okay?

Thanks
0
#2
Also, in general for M1 past papers, I'm guessing no marks are given for your diagrams, right?

Also, I tend to see, for example, this

20cos30° = T cos60° M1 A2, in MS

but I'd write down, 20cos30 - Tcos60 = 0 instead, I'm guessing this is still okay, right?

Thanks, better to be safe than sorry.
0
#3
Bump
0
#4
0
6 years ago
#5
(Original post by krisshP)
http://examsolutions.net/a-level-mat...uary/paper.php

See q2b and the corresponding mark scheme for this question part.

I did this

(1/2)(2)(8) + 8T + (1/2)[75-(T+5)](8)=500

20 + 8T + 4(70-T)=500

...

T=50s

The mark scheme used the trapezium method to get area, but I used a different method and still got the right answer. So do I get full marks still? Aren't the A2 methods there for the method which is right or what?

Also, for the same paper, see q6d. Would 3.97m (3SF) be okay?

Thanks
You would still get full marks. You have just divided the trapezium into a 2 triangles and a square. If it makes sense and if you clearly show the working then you would still get the method marks.

I'm not sure whether they would accept 3.97. I've always thought that the number of S.F must be less than or equal to the least accurate figure given.
0
6 years ago
#6
(Original post by krisshP)
Also, in general for M1 past papers, I'm guessing no marks are given for your diagrams, right?

Also, I tend to see, for example, this

20cos30° = T cos60° M1 A2, in MS

but I'd write down, 20cos30 - Tcos60 = 0 instead, I'm guessing this is still okay, right?

Thanks, better to be safe than sorry.
This is perfectly fine. It's the same thing.
0
#7
(Original post by LilacLily)
You would still get full marks. You have just divided the trapezium into a 2 triangles and a square. If it makes sense and if you clearly show the working then you would still get the method marks.

I'm not sure whether they would accept 3.97. I've always thought that the number of S.F must be less than or equal to the least accurate figure given.
So I shouldn't round to 3 SF and do that rounding method, right? Doesn't it say at the front of each M1 paper that if unsure round to 3SF, so 3SF is okay? This is so confusing.

(Original post by LilacLily)
This is perfectly fine. It's the same thing.
OK thanks again
0
X

new posts
Back
to top
Latest
My Feed

### Oops, nobody has postedin the last few hours.

Why not re-start the conversation?

see more

### See more of what you like onThe Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

### Poll

Join the discussion

#### Have you experienced financial difficulties as a student due to Covid-19?

Yes, I have really struggled financially (53)
17.21%
I have experienced some financial difficulties (88)
28.57%
I haven't experienced any financial difficulties and things have stayed the same (117)
37.99%
I have had better financial opportunities as a result of the pandemic (40)
12.99%
3.25%