Maths Extension 2 Predictions/Thoughts (3 Viewers)

[lucas10champ]

so what do u think they will not mark the question altogether or try and cover up their mistake.

bro they definitely aint removing the question, i dont think theres a problem with it cause the exam gets checked many times and it would have been noticed a long time ago

 

[cheesynooby]

it doesn't seem like that big of a problem since the intended solution still works so maybe they'll just mark both solutions correct

 

[BionicMango]

Sure. But the projectile is travelling in the 4th quadrant and sin is negative. Also when you have a mass suspended from the ceiling, the left sided horizontal component is - cos because it’s in the second quadrant.

Yeah sin is negative, it’s just that I think they were assuming ‘theta’ is just a positive value and that it had to be inferred that this meant the y was negative. As in, the horizontal component is 50cos(-theta) and vertical is 50sin(-theta). I get what you mean though, they should have said -3/5.

 

[v.tex]

Literally now just gotta do textbook questions to do well in ext 2 math, unlike other years when the past papers actually counted

 

[tywebb]

mark both solutions correct

i do 3

 

[BionicMango]

i do 3

View attachment 50094

OH right because the value of A is clearly just a real number which means that any definite integral will be a constant multiple of A since that's how real numbers work (as long as all terms are made up of either constants or the dummy variable). If anything the e^(-m) term is the closest thing to a 'variable' so the integral can't be written like kA. So either most of the familiar functions' definite integrals will work or none of them will.
Method 1 is my favourite of course