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M2 collisions question

https://drive.google.com/file/d/0B8iKfLNIO4P4YVZNUmkwbm5KMVU/view?pref=2&pli=1

Question 2 part a. It only works when u put Vp>0 and not Vq>0. They both move in the same direction and should give the same answer, why does it not work? Help pls.
Original post by shehab77
https://drive.google.com/file/d/0B8iKfLNIO4P4YVZNUmkwbm5KMVU/view?pref=2&pli=1

Question 2 part a. It only works when u put Vp>0 and not Vq>0. They both move in the same direction and should give the same answer, why does it not work? Help pls.


The problem is that you are looking for a restriction on e.

Vp will be positive or negative depending on e.
BUT, Vq will always be positive, so it's not going to tell you anything about e.
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shehab77
OP
Original post by ghostwalker
The problem is that you are looking for a restriction on e.

Vp will be positive or negative depending on e.
BUT, Vq will always be positive, so it's not going to tell you anything about e.


Thanks a lot! How are u so good at this???
Original post by shehab77
How are u so good at this???


Reasonably mechanically minded - always have been.

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