anonymous
  • anonymous
A skier (m=57.0 kg) starts sliding down from the top of a ski jump with negligible friction and takes off horizontally. If h = 6.20 m and D = 13.4 m, find H.
Physics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
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anonymous
  • anonymous
what is "h" ?
anonymous
  • anonymous
Use the energy method. Decrease in potential energy= gain in kinetic energy mg(H-h) = 1/2 mv^2 here we get the velocity. After taking off, the range is given by R= u. t where "t" is the time of descent and 'u' is the velocity.
anonymous
  • anonymous
Hope its clear

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anonymous
  • anonymous
(1/2)mv^2=mgD so v=sqrt(2gD) v on above is v0 for next part of ask (when skier leave ski jump) y=(v0^2/2*g) so H=y+h
anonymous
  • anonymous
isn't "d" the distance covered after he jumped?
anonymous
  • anonymous
i think D is ski jump's length
anonymous
  • anonymous
i drew above do you solve it?
anonymous
  • anonymous
D should be the range i feel.
anonymous
  • anonymous
Let us take D to be the range. Now, decrease in potential energy would be mg(H-h) as he came down a height of H-h So, mg(H-h) = 1/2 mv^2 v=(2g(H-h))^1/2
anonymous
  • anonymous
question want H did you get it?
anonymous
  • anonymous
yes.
anonymous
  • anonymous
so it is...?
anonymous
  • anonymous
approximately 15.026
anonymous
  • anonymous
how did you get time of descent
anonymous
  • anonymous
t= {2h/g}^1/2
anonymous
  • anonymous
this t is time of H time of descent is: 2*t
anonymous
  • anonymous
how did you take v=u in two formula? mg(H-h) = 1/2 mv^2 R= u. t
anonymous
  • anonymous
D= v. t where v= [2g(H-h)]^1/2 and t= [2h/g]^1/2 "t' is the time of descent from "h" to the ground. I typed u instead of v
anonymous
  • anonymous
u is velocity of body when it's arrive to ground but vis velocity in top of path
anonymous
  • anonymous
no i think you use 2*t in formula for D
anonymous
  • anonymous
hence d is all of horizontally path
anonymous
  • anonymous
|dw:1331643793186:dw|
anonymous
  • anonymous
"v' is the velocity of the man before taking off. We are not concerned about the velocity which he will have while landing on the ground
anonymous
  • anonymous
Yes "D" is the horizontal distance covered.
anonymous
  • anonymous
did you see my diagram ? H is max height that man arrive . i didn't understand your fig
anonymous
  • anonymous
i mean that how did you yeild to u=v
anonymous
  • anonymous
When a body takes off horizontally, the height from which it took off will be the maximum height. i took that the person slides from a height "H" and after reaching a height "h', he takes off and covers a horizontal distance 'D". I mistyped u or v.
anonymous
  • anonymous
mistyped u for v
anonymous
  • anonymous
am i clear?
anonymous
  • anonymous
yes you'r right

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