2002 HSC Q6 (a) part (iii) -- check my answer (2 Viewers)

[blackops23]

http://www.boardofstudies.nsw.edu.au/hsc_exams/hsc2002exams/pdf_doc/mathemat_ext1_02.pdf

PROJECTILES QUESTION:

For Q6 (a) part (iii) I got a maximum height of 27m, however the answers my teacher provided state that it is

Can someone please check the answer for me? Thanks

 

[OldMathsGuy]

http://www.boardofstudies.nsw.edu.au/hsc_exams/hsc2002exams/pdf_doc/mathemat_ext1_02.pdf

PROJECTILES QUESTION:

For Q6 (a) part (iii) I got a maximum height of 27m, however the answers my teacher provided state that it is

Can someone please check the answer for me? Thanks

I can guarantee that the answer is 15.125m.
Can you outline your solution? There's most likely a good learning opportunity with this question.

Best Regards
OldMathsGuy

 

[K4M1N3]

I think they found x = 27 (which i found as well)

you then need to sub in and find the maximum y value

*tested and confirmed: maximum y value (y = 15.125) at x = 27

 

[artosis]

 

[blackops23]

I think they found x = 27 (which i found as well)

you then need to sub in and find the maximum y value

*tested and confirmed: maximum y value (y = 15.125) at x = 27

SILLY mistakes at its finest. yes i found x = 27 when y' = 0 inb4 E3 at the HSC...

 

[taeyang]

SILLY mistakes at its finest. yes i found x = 27 when y' = 0 inb4 E3 at the HSC...

>implying E3 is bad.