Pelican Flying Problem

  • Thread starter Mitxigan
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  • #1
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A pelican flying along a horizontal path drops
a fish from a height of 4.9 m. The fish travels
7.5 m horizontally before it hits the water
below.
What was the pelican’s initial speed? The
acceleration of gravity is 9.81 m/s^2
Answer in units of m/s


If the pelican was traveling at the same speed
but was only 3.0 m above the water, how
far would the fish travel horizontally before
hitting the water below?
Answer in units of m


Can someone help me i have no idea how to solve this im lost.
 

Answers and Replies

  • #2
BvU
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Sure. You did well on nuber one of the template. Now help us to provide adequate assistance (at the right level) by also completing 2 and 3. PF rules don't allow us to help if you don't . Why ? See the guidelines !

1. Homework Statement

Homework Equations


3. The Attempt at a Solution
[/B]
And eh, welcome to PF !
 
  • #3
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Sure. You did well on nuber one of the template. Now help us to provide adequate assistance (at the right level) by also completing 2 and 3. PF rules don't allow us to help if you don't . Why ? See the guidelines !

1. Homework Statement

Homework Equations


3. The Attempt at a Solution
[/B]
And eh, welcome to PF !
ok number 2 is

vx
dx 7.5
t

vfY
voY 0
aY -9.8
dY -4.9
t

i used this equation

s=1/2gt^2

but i can get the right answers

and number 3 is

i used that equation but i can´t get the right answer


and sorry im new idk how to ask correctly here and stuff
 
  • #4
NascentOxygen
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s=1/2gt^2
When you use this equation, what is the result telling you?
 
  • #5
BvU
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2. ) s=1/2gt^2
What is s ?
 
  • #7
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What is s ?
like i get the wrong answer all the time
 
  • #8
BvU
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Like you multiply m/s^2 with s^2 and you are surprised you don't get something with the dimension of m/s ?
 
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  • #9
haruspex
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s is speed
No, in the standard SUVAT equations s is distance. Speeds, initial and final, are represented by u and v.
 
  • #10
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Like you multiply m/s^2 with s^2 and you are surprised you don't get something with the dimension of m/s ?
No is just that i get the answer wrong not the dimensions
 
  • #11
NascentOxygen
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So now apply the equation I quoted, and describe what it can tell you. (Remember, s is not speed.)
 
  • #12
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So now apply the equation I quoted, and describe what it can tell you. (Remember, s is not speed.)
No, in the standard SUVAT equations s is distance. Speeds, initial and final, are represented by u and v.
I used the equation Vx=deltaX/t

And i got it right thanks tho ;)
 
  • #13
NascentOxygen
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I used the equation Vx=deltaX/t

And i got it right thanks tho ;)
That's the only equation you used? Since you showed no working here, we'll have to accept your word that you solved it correctly.
 

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