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# Edexcel IAL M2 Mathematics WME02 ~ 9th June 2015 watch

1. I also got 4.08.

However, i think i got 4/5k for i.
2. For the moments question do you have to take F>/= R(fromc)Cos(theta) to get the K inequality ?
3. i also found k=4.08 and for the second part i wrote (R-2k)i and R is the range of the projectile,then i found R but i dont remember it now

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4. I did the IAL M2 today and about the center of mass question the correct method is to treat the triangular framework (without the individual masses) as a 'framework' by multiplying the 'lengths' of the rods 5a, 4a, 3a by their centers and THEN finding the center of mass of the triangular framework and the two masses by multiplying the 'masses' of the three (The two masses+framework) by their centers,

AND the wrong method is to treat the whole System 'S' as masses only and find the center of mass.

However if u do either methods the difference between angles will be 2 degrees.

Wrong method (Treating all as masses) gives --> 36 degrees.
Correct method (Treating triangle as framework then as masses) gives --> 38 degrees.

I don't know if the examiner will treat this slight difference as a major mistake or not.

Somebody correct me if I'm wrong.
5. I ised the correct method you outlined and still got 36.1
6. (Original post by IH09)
I ised the correct method you outlined and still got 36.1

What co-ordinates did u get for the center of mass?
7. I might ve gotten a 37.5 then again
8. How do you go back to old calculations in the calculator?
9. (Original post by IH09)
How do you go back to old calculations in the calculator?
Did you get:
x bar = 30/17
y bar = 12/17
10. What I get:
tan pheta = 10/13

Angle =37.568...
=37.6 degress
11. (Original post by hank_the_tank)
What I get:
tan pheta = 10/13

Angle =37.568...
=37.6 degress
Correct!
I unfortunately used the wrong method in the exam I hope to lose 2 to 3 marks Max...
12. (Original post by Yousef Khashaba)
Did you get:
x bar = 30/17
y bar = 12/17
I got that. Then you have to do 3a -12a/17 right ?
13. (Original post by Trixenity)
I got that. Then you have to do 3a -12a/17 right ?
Yeah then it'll be tan^-1( [30/17]/[3a - (12a/17)]
14. Please tell me! Are Mechanics 2 papers harder in JAnuary than in June??? Help!!

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