Where Does the Kinetic Energy Equation KE = mgR(1-cos theta) Originate?

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The discussion revolves around the origin of the kinetic energy equation KE = mgR(1-cos theta) and its relation to finding the angle theta in a homework problem. The equation h = L(1 - cos theta) is used to solve for theta, prompting questions about whether the kinetic energy equation is a known formula or if it should be derived from fundamental principles. Participants note the importance of understanding the derivation to grasp its application fully. Without specific details about the homework problem, providing targeted assistance is challenging. The inquiry highlights the need for clarity on the foundational concepts behind the equations used in physics.
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For a particular homework problem, we needed to find an angle theta.

This equation was used: h = L(1 - cos theta) to solve for theta.
I guess that came from the Kinetic Energy equation KE = mgR(1-cos theta),
but where does that kinetic energy equation come from?

Is it just an equation to know, or was I supposed to have derived this from something?

Thanks,
Nash
 
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Without seeing the particular homework problem, it's impossible to help you.
 

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