Year 12s: what will be the first way you research your future options? >>

AQA A2 Mathematics (Old Spec) - Mechanics 2 MM2B - 25 June 2018 [Exam Discussion]

Scroll to see replies

Some of my answers I can remember:

t = 13.0s
u = 4sqrt(ag)
u : v = 2 : sqrt(5)
r = sqrt(3)/4 * L (really not sure about this one)

Lmao will I lose a mark for leaving is as 4:2sqrt5
I just realised what a jackass I am, I got 259seconds for that question cos I had written that equation to be /600 instead of 30 ffs.
How many marks am I gonna lose for that :frown:

how to get dv/dt？

Original post by Parhomus

I got u=4root(ag)

I got 4rootag,and 4:5 for part 2

Reply 23

Sanjeevan311

Original post by Tom22561

I got 3.6 any one else?

yep

Reply 24

math24601

Original post by Parhomus

I left it as 4:2sqrt5 so hopefully not many lmao

Reply 25

math24601

Original post by OllyBishop

Some of my answers I can remember:

x̅ = 52cm
m = 2.67kg
t = 30ln(11.4/(3g-v)) -> when v = 22ms^-1, t = 13.0s
u = 4sqrt(ag)
u : v = 2 : sqrt(5)
r = sqrt(3)/4 * L (really not sure about this one)

I got all of these and ŷ as 40.5cm I think

Reply 26

Sanjeevan311

Original post by Parhomus

2.67kg

Did u take into consideration the mid point of the lamina, cuz I got 3.6

Reply 27

Glo1999

Original post by Tom22561

What mass did people get on q 1?

8/3 kg I think, so like 2.67

Reply 28

Sanjeevan311

Original post by Octopus1204

how to get dv/dt？

differentiation, anyone

Reply 29

Parhomus

Original post by Sanjeevan311

Did u take into consideration the mid point of the lamina, cuz I got 3.6

Yes.
I did it by moments about the midpoint as well and got the same answer.

Reply 30

zeldor711

Made two mistakes:

When doing Q7 c I wrote down my previous equation wrong.

When doing Q8 when I cancelled the reaction forces near the end I cancelled down to 0 instead of 1 on one side. Feel like a right idiot.

Reply 31

Parhomus

Does anyone know how the method marks work?
Will I get all the method marks for question 5 considering I did it all correct, but accidentally had written the dv/dt equation to be 3v-g/600 in the calculus question.
:frown:

Such a stupid thing to lose marks for honestly