Is the Second Hint for Newton's Law of Restitution Correct?

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The discussion centers on verifying the correctness of the second hint related to Newton's Law of Restitution. Participants confirm that the coefficient of restitution measures the ratio of relative velocities during separation and approach. There is clarification that only the vertical component of velocity is relevant in the context of the second question, as it aligns with the normal direction. The conclusion emphasizes that this consideration is consistent with the principles of the law. Overall, the hints provided in the blog post are deemed accurate.
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Homework Statement


http://mediocre.wordpress.com/2008/01/09/Newtons-law-of-restitution/
Shown in my blog, link provided.

Homework Equations


Newton's Law of Restitution, v2 - v1 = e (u1 - u2)


The Attempt at a Solution


I have done the question, actually...but I need confirmation. Can anyone please help me to check whether the no.2 hint is correct or not? (Located at the bottom of the post)

Thanks in advanced.
 
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Quite correct. The coefficient of restitution is the ratio of the magnitude of the relative velocity of separation to that of the relative velocity of approach in the normal direction.
 
Yeah, but though I get the answer, I am not sure why only the vertical component of velocity is considered in the 2nd question. Or am I wrong?
 
No, you are right. The vertical component is in the normal direction. For now, you can take it to be a law of nature.
 

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