Poss Textbook Error Concerning Momentum

[MariettaBlau]

From Matter & Interactions Volume 3:

Am I correct that there is something wrong with the statement of the velocity vector here? The components are missing in the statement of the problem, yes?

 

[slider142]

Since the proscribed answer clearly uses information that cannot be derived from the information given, that would definitely be a case. A very large typo. :)

 

[BiGyElLoWhAt]

Yea that doesn't look right to me. Either components or phi,theta measurements. Is it possible that this question is a subset of another question that did give angle measurements? Or maybe it's an entirely different solution, as the problem statement says the velocity is 2E7, whereas the solution says the speed is 3.7E7.

This looks relativistic, is that speed relative to a moving observer?

 

[MariettaBlau]

Thank you both for the replies. I just wanted to be sure. It was not a subset of another question. Just an error. This text seems to have quite a few unfortunately.