Question

hey guys how do you determine initial height

Answer 1

Are you talking about for a quadratic model...like the path of a ball?

Answer 2

you measure how far from the ground you are when you start

Answer 3

if you know how long it took you to fall, you can work backwards, but in some cases thats just irreleveant :)

Answer 4

and depending on the height from which you fell, it might be tough for you to do anything.

Answer 5

yes, it's a football

Answer 6

and it's a quadratic model, yes

Answer 7

the initial height of a football tends to be either 0 or up to 3 ft on average

Answer 8

right but there's a way to find out without guessing i would assume

Answer 9

youd have to have alot more information than ... look! its a bird, its a plane, its... a football :)

Answer 10

this is all they give you. i dunno what i'm doin here

Answer 11

3 points of reference determine a parabola

a constant velocity can be worked backwards but without inital conditions to calibrate for, there aint much you can hope for

Answer 12

for the record it's supposed to be 0.31

Answer 13

if all they give you for your problem is what youve given us; there is no good way to determine it ..

they dont give you an equation to play with?

Answer 14

H=-0.7(d-8.7)^2+7.6

Answer 15

ok .... i assume H is a height function; but what is d?

Answer 16

d is modified so that the its in the first quadrant of a graph

Answer 17

it might be distance if the other numbers represent distance and height

Answer 18

or it could be t, for time. i don't know.

Answer 19

when the distance = 0 then you have your initial staring height right?

Answer 20

i have terrible handwriting.

Answer 21

yeah but there's distnace away from the kicker and maximum height

Answer 22

i got like -45 when i did it wth 0

Answer 23

this is what they graph looks like yep; -45 sounds about right ... which means there is something missing from the info
http://www.wolframalpha.com/input/?i=-0.7%28d-8.7%29^2%2B7.6

Answer 24

alright well it's not 0.31 so i'm still confused but w/e
if there's nothing more that can be determined then i guess that's that

Answer 25

a vulcan mind meld would help; but i dont think thats an option :)

Answer 26

right
but how is 0.31 even remotelly related to -45
is there someting else i have to do or did i screw up somewhere

Answer 27

with just the information you have given us, there is nothing that we can do.

Answer 28

alright thanks