Understanding Circuits: Calculating Velocity at 25.5 km/h

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The discussion revolves around the calculation of velocity in a circuit, specifically questioning why it is stated as 25.5 km/h instead of a round figure like 25 km/h. Participants express confusion over the potential error in the resource being referenced, suggesting it may be a simple mistake. The age of the website, being over ten years old, raises concerns about the accuracy of its content. Overall, the conversation highlights the importance of verifying educational resources for clarity and correctness. Accurate information is crucial for understanding fundamental concepts in circuits.
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http://library.thinkquest.org/10796/ch2/Img00003.gif

I was looking on a resource to help explain to me the concept of circuits.. Then realized that it's almost as if my teacher has plagiarized from this site for his lesson plan..:smile: Anyhow, just going over the old lessons of the site..

How do they calculate the velocity to be 25.5 km/h? Simple mistake, I'm hoping?
 
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simple mistake indeed.
 
you mean why is it 25.5 instead of 25? I think that's clearly a mistake unless I'm not catching something
 
Just making sure.. Wonder why they would have a mistake like that for a 10 year old site.
 
Kindly see the attached pdf. My attempt to solve it, is in it. I'm wondering if my solution is right. My idea is this: At any point of time, the ball may be assumed to be at an incline which is at an angle of θ(kindly see both the pics in the pdf file). The value of θ will continuously change and so will the value of friction. I'm not able to figure out, why my solution is wrong, if it is wrong .
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