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  1. S

    Mathematics: Post your doubts here!

    You should use the marking scheme for answers. Youshould then post what you did not understand from it then I can explain
  2. S

    Mathematics: Post your doubts here!

    Did you round off or some stuff? Cause I'm getting an answer close to it (15.7km). Btw I do not believe we get this in cambridge examinations( especially because neither integration/differenciation nor applying motion equations is to be required) Edit: What i did was, displacement of...
  3. S

    A in gp? Hard enough.

    A in gp? Hard enough.
  4. S

    Maths completeing the square help

    x={-b+-√(b^2-4ac)}/2a a=2, b=-4, c=-7 x={4+-√(72)}/4 x= 1+-(√(4*2*9))/4 x=1+-(6√2)/4 x=1+-(3√2)/4 <----- your answer If you complete square you get something like this, x= 1+- 3/√2 then you rationalise by multiplying with √2/√2
  5. S

    Mathematics: Post your doubts here!

    It's not EVEN THOUGH, it's BECAUSE there is a Negative sign before the power that it it tends to zero. Qwertypoiu gave a detailed explanation about it hope it helps
  6. S

    Mathematics: Post your doubts here!

    You have the equation already use t= infinity and you will see e^-t becomes 0, therefore value of x reaches a constant which i got 47.8<48 If you can't do it in exams just press e^-100000 on your calculator.
  7. S

    Mathematics: Post your doubts here!

    When you do these type of M1 questions, always relax, take your pencil and draw the scene that's happening in the question. It's very easy when you can visualise it your brain processes much better.( You also make examiners understand your work better) 1. P.E=mgh = 18*15000*10 = 2.7*10^6 J 2...
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    How long does it take to complete the S2 syllabus?

    According to my friends.( I did not do S2): You can crash course under less than 2 months, but you will need to work out much papers. Luckily most questions are like hindi movies, they repeat themselves so often you will get bored. Very easy paper btw, if you can remember all the theory, you...
  9. S

    Mathematics: Post your doubts here!

    Fairly easy im just giving the logic you work the rest A. It says velocity same, time also is same. Equate with v=u+at and solve, i got t=1s. Then replace t in equation s=ut +0.5at^2 S=9m B. Distance same time same use s=ut +0.5t^2 T=0 or t=2s Replace in v=u+at V=4m/s Make sure you understand...
  10. S

    Does anyone have P4 topicals for chemistry A2 with answers?

    From what I've understood, yes next monday or in 2days time but he might also be busy so just wait. Theres still time for the chem exams
  11. S

    Mathematics: Post your doubts here!

    Pretty sure no inverse for cubic because it is not one-one, but if you want to find try this. Let y=F(x) Find a factor of x where remainder is 0 Use long division You got 3 factors just solve inverse like you usually do. This is where the prob starts, theres 3factors and you cant just choose one...
  12. S

    Mathematics: Post your doubts here!

    You got your drawing of a circle and a line with angle π/4, do you not get a right angle triangle ? If you do just use cos/sin π/4=x/|z|, where x is either the adjacent or opposite depending on the sketch, sorry I'm on mobile can't draw it for you maybe tommorow I do it
  13. S

    Problem in S1( Maths P6)

    Thanks to both of you, cleared some doubts in my head. Will try my best to aim for that A* in maths
  14. S

    Classified A level Physics MCQs upto 2015

    I agree with your point. But monetizing is not a really "cool" way of sharing. Though,I believe deep inside you are acting for the benefit of students so I'm not that much of a douche and apologise if I offended you in any way. Point to be noted: I do not know whether we can put paid stuff, it...
  15. S

    Problem in S1( Maths P6)

    Sorry but histograms and cumulative frequency are 2 different graphs?! Besides many questions asking mean/sd use and dont use boundary for each kind
  16. S

    Does anyone have P4 topicals for chemistry A2 with answers?

    You are the boss
  17. S

    Problem in S1( Maths P6)

    Uhm so yeah regarding cumulative frequency, 1. Can we draw a cumulative frequency polygon instead of a curve if it says draw cumulative frequency graph? by polygon i mean joining points plotted with ruler. 2. Anyone can tell me when do we need to use boundaries instead of real values for...
  18. S

    Mathematics: Post your doubts here!

    Just make sure you understood that convergent means |r|< 1. Why? Because convergent means narrowing down to a definite value(intersecting you may call) What gives a definite value for sum to infinity in a geometric progression is when |r|<1
  19. S

    Classified A level Physics MCQs upto 2015

    Are you even allowed to publish paid stuff here btw? I mean you will only receive negative comments doing so anyway... This is sharing forum, not a trade centre for godsake
  20. S

    How was Mechanics Paper 52?

    Sorry I just saw mechanics written and blurted that out. But really that m1 though :v
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