Math Homework-lamsey I Need You!

[4play]

Originally posted by RGX@24 March 2004 - 23:56
The answer is 42.

someone has been watching the hitchikers guide to the galaxy.

[Illuminati]

Actually, just for the hell of it - I will try to write both geometric & mechanic solutions to this tomorrow

Just not right now - I need sleep

[Lamsey]

Originally posted by Illuminati@25 March 2004 - 00:14
A) will be where the maximum stationary point is. In other words, it'll be where dy/dx (differential of y in respect to x) will be zero. All you need is the y co-ordinate
B) will be the same as a, except it'll be the x co-ordinate
C) will be when y = 0 - Substitute 0 for y and find x for the answer
D) will be when x = 0 - Find f(x) when x = 0 Find y for the answer

Can't be bothered working them out but that's what you're supposed to do.

Co-Ordinate Geometry, Pure 1/2, English A-Level Mathematics

Technically you could in theory solve it in a mechanics sense as well, but that's for another day

What he said.

I will give you a hint: the derivative of the equation of that curve is

dy/dx = -2x + 10

[RGX]

Originally posted by 4play+25 March 2004 - 01:19--></div><table border='0' align='center' width='95%' cellpadding='3' cellspacing='1'><tr><td>QUOTE (4play @ 25 March 2004 - 01:19)</td></tr><tr><td id='QUOTE'> <!--QuoteBegin-RGX@24 March 2004 - 23:56
The answer is 42.

someone has been watching the hitchikers guide to the galaxy. [/b][/quote]
Actually I read it when I was 10-12

[4th gen]

Originally posted by Lamsey@25 March 2004 - 00:21
What he said.

I will give you a hint: the derivative of the equation of that curve is

dy/dx = -2x + 10

10 - 2x is surely a cleaner representation?

[Legolas]

i know one way of doing it, the one my math teacher likes, and tat would be to first find the maximum (turning point) which i concluded to be x=5 and y= 59. This is the height. meaning, after 5 seconds, the height will be 59. is this right at least?? My math teacher told me that the next step is to take 4 number below 5 and 4 numbers above 5 and substitute them into the original equation. That will give different times and heights. Am i right?

[Lamsey]

Originally posted by 4th gen+25 March 2004 - 00:23--></div><table border='0' align='center' width='95%' cellpadding='3' cellspacing='1'><tr><td>QUOTE (4th gen @ 25 March 2004 - 00:23)</td></tr><tr><td id='QUOTE'> <!--QuoteBegin-Lamsey@25 March 2004 - 00:21
What he said.

I will give you a hint: the derivative of the equation of that curve is

dy/dx = -2x + 10

10 - 2x is surely a cleaner representation?

[/b][/quote]


I think I see Dr. Bramley in the corner

[Legolas]

for C, i got 2 answers. i got 8 and 2. which is right? which should i reject???