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# M2 collisions question watch

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.
2. (Original post by shehab77)

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.
3. (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???
4. (Original post by shehab77)
How are u so good at this???
Reasonably mechanically minded - always have been.

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