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

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Homework Help Overview

The discussion revolves around Newton's Law of Restitution, specifically examining a hint related to the problem presented in a blog post. Participants are seeking clarification on the application of the law and the relevance of velocity components in the context of the problem.

Discussion Character

  • Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • The original poster seeks confirmation on the correctness of a hint regarding the law of restitution. Some participants discuss the significance of considering only the vertical component of velocity in the context of the problem.

Discussion Status

The conversation includes attempts to clarify the reasoning behind focusing on the vertical component of velocity, with some participants affirming the appropriateness of this approach. There is an ongoing exploration of the implications of this focus without reaching a definitive consensus.

Contextual Notes

Participants are navigating the nuances of the problem, particularly regarding the components of velocity involved in the application of the law of restitution. The original poster expresses uncertainty about the hints provided, indicating a need for further discussion.

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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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