- #1
Lolagoeslala
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Homework Statement
solve this change in velocity when the V2` = 19.04 m/s [S59W]
and V2=16.32 m/s [S36W]
Homework Equations
The Attempt at a Solution
I solved this using the components method first, for which i got the answer 7.536 m/s [W 26.78 N]
And now for the vector subtraction piece:
I did this diagram:
http://s1176.beta.photobucket.com/user/LolaGoesLala/media/dffdfd.jpg.html
So this is what i did
I used cosine law like this:
Δv^2 = (19.04)^2 + (16.32)^2 -2(19.04)(16.32)cos23
Δv= 7.536
then i used sine law like this:
7.536/sin23 = 19.04/sinx
for x = 81°
and then when i place it into the diagram and subtract 36 from it, i get 45°. So obviously it would be [W 45 N] but by using the components method i get a totally different angle why?