December 13th, 2016, 05:23 PM  #11 
Math Team Joined: May 2013 From: The Astral plane Posts: 2,200 Thanks: 898 Math Focus: Wibbly wobbly timeywimey stuff.  Close enough that the one thing you got wrong is probably just a typo. The y component is $\displaystyle \frac{1}{2} (t + 4)^{3/2}$ Good job. Now how about that cosine formula? The angle between any two vectors v and a is given by the dot product $\displaystyle v \cdot a = v~a ~ cos( \theta )$. Can you find $\displaystyle \theta$? Dan Last edited by topsquark; December 13th, 2016 at 05:27 PM. 
December 14th, 2016, 01:26 AM  #12 
Newbie Joined: Dec 2016 From: Hungary Posts: 12 Thanks: 0 
hellooo ?

December 14th, 2016, 05:34 AM  #13 
Math Team Joined: May 2013 From: The Astral plane Posts: 2,200 Thanks: 898 Math Focus: Wibbly wobbly timeywimey stuff. 
Hello and good morning! How are you coming along with the cosine formula? Dan 

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angles, exercise, find, impossible, vectors 
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