idku
  • idku
One question.
Mathematics
  • Stacey Warren - Expert brainly.com
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katieb
  • katieb
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idku
  • idku
``` Julie throws a ball to her friend Sarah. The ball leaves Julie's hand a distance 1.5 meters above the ground with an initial speed of 11 m/s at an angle 44 degrees; with respect to the horizontal. Sarah catches the ball 1.5 meters above the ground. ``` |dw:1441299455460:dw|
idku
  • idku
theta = 44° and I need the distance between the two people
geerky42
  • geerky42
Plan is to figure out the time it takes for ball to go from Juile to Sarah. For that, we focus on vertical component. After that, we can focus on horizontal component and figure out the distance.

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idku
  • idku
I have found so far: 1) Horizontal Component of the Velocity: \(\\[0.8em]\) \(V_x~~=~~V_0\times \cos(\theta)~~=~~11\times \cos(44)~~=~~11\cos(44)\) 2) Vertical Component of the Velocity: \(\\[0.8em]\) \(V_y~~=~~V_0\times \sin(\theta)~~=11\times \sin(44)~~=~~11\sin(44)\) 3) Maximum Height: \(\\[0.8em]\) \(V_y~~=~~V_{0y}-gt\) \(0~~=~~11\sin(44)-9.81t\) so max height ocucrs at \(t=11\sin(44)/9.81\) and now we plug that into vertical displacement: \(y=V_{0y}\times t+y_0\) \(y=11\sin(44)\times \left( 11\sin(44)~/~9.81\right)+1.5 \approx 4.5 ~~({\rm meters})\)
idku
  • idku
What formula would I use to find the time that takes the ball to fly from one person to another?
idku
  • idku
Disregard the previous long 3 part reply, that is more for myself.
geerky42
  • geerky42
Because initial height and final height are same, we can just double the time it takes for ball to reach maximum height.
IrishBoy123
  • IrishBoy123
yeah, you don't need to know how high it went, just how long it was in the air for
idku
  • idku
Can we go by the first thing you proposed please? \(\color{blue}{\text{Originally Posted by}}\) geerky42 Plan is to figure out the time it takes for ball to go from Juile to Sarah. For that, we focus on vertical component. After that, we can focus on horizontal component and figure out the distance. \(\color{blue}{\text{End of Quote}}\)
idku
  • idku
Which formula am I starting to use, can you please tell me?
geerky42
  • geerky42
You figured out the time it takes for ball to reach max, so just double it (2t), then we got time we need.
idku
  • idku
ok, so we need `22sin(44) / 9.81` seconds, (roughly 4.5 × 2 = 9) seconds.
idku
  • idku
ok, and then how would I use the time between them to find the distance between them>
geerky42
  • geerky42
Just focus on horizontal component. We know that horizontal velocity doesn't change, so formula is simply \(d = vt\) we have time and horizontal velocity, so we can multiply them to get distance.
geerky42
  • geerky42
Makes sense, right?
idku
  • idku
oh, so d=11cos(44)×(11sin(44)÷9.81)= (11/19.62) sin(88)
idku
  • idku
11cos(44) is v 11sin(44) / 9.81 is time
geerky42
  • geerky42
actually time is 22sin(44)/9.81 remember we need time it takes for ball to go from Julie to Sarah.
idku
  • idku
Ok, 12.32 is wolfram's approximation. How does it exactly work.....? d=vt Only gives us 1/2 of the distance for some reason?
idku
  • idku
or rather full time is 2t.
idku
  • idku
so t is 2t:)(()()()()
geerky42
  • geerky42
Yeah
idku
  • idku
Ok, I am very curious, because on my test it would probably not be this way. Can you expain how would you go about doing your original approach that you proposed? ``` Plan is to figure out the time it takes for ball to go from Juile to Sarah. For that, we focus on vertical component. After that, we can focus on horizontal component and figure out the distance. ```
geerky42
  • geerky42
More of less same as what we just did. Horizontal component is very simple \(d = vt\), however we only know the value of \(v\). So I'd just calculate full time with given vertical velocity by using \(V_y = V_{o_y}−gt\) Initial velocity and final velocity should be opposite, right? So we have \[-V_{o_y} = V_{o_y}-gt\quad\Longrightarrow\quad\dfrac{2V_{o_y}}{g}=t\] Now we got \(t\), so we then calculate distance.
idku
  • idku
Oh Vy=Voy - gt is what we would have used. Tnx
geerky42
  • geerky42
No problem

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