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what is "h" ?

Hope its clear

isn't "d" the distance covered after he jumped?

i think D is ski jump's length

i drew above do you solve it?

D should be the range i feel.

question want H did you get it?

yes.

so it is...?

approximately 15.026

how did you get time of descent

t= {2h/g}^1/2

this t is time of H time of descent is: 2*t

how did you take v=u in two formula?
mg(H-h) = 1/2 mv^2
R= u. t

u is velocity of body when it's arrive to ground but vis velocity in top of path

no i think you use 2*t in formula for D

hence d is all of horizontally path

|dw:1331643793186:dw|

Yes "D" is the horizontal distance covered.

did you see my diagram ? H is max height that man arrive . i didn't understand your fig

i mean that how did you yeild to u=v

mistyped u for v

am i clear?

yes you'r right