Relativity Problem: Find Speed & Momentum

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The discussion revolves around a relativity problem involving a moving particle with a rest mass that is double its kinetic energy, prompting inquiries about how to find its speed and momentum. Participants express curiosity and engage in light banter, with one member indicating they know the answer but prefer to let others respond first. Another member emphasizes the importance of maintaining a calm demeanor, highlighting the intriguing nature of physics discussions. The conversation reflects a mix of frustration and enthusiasm for solving complex physics problems. Ultimately, the focus remains on collaboratively finding a solution to the stated relativity question.
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hey i came across this question on the web..has to do with relativity...i was jus wondering if anyone knew how to go about doing it ..."a moving aprticle has a rest mass which is double its kinetic energy. fins its speed and momentum"...
 
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oh excellent question aptiva i of course know the answer but i will sit back and allow others a chance
 
aptiva what website may i ask did u find it on i wud like to go set its ass on fire
 
well hype_chicky...i think u should settle down..there is no need for stress...its remarkable to see how one little problem can ignite one to react in such a peculiar manner ... that's just what i love about physics...but back to the real problem...would anyone know how to go abouts solving this?
 
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 .
TL;DR Summary: I came across this question from a Sri Lankan A-level textbook. Question - An ice cube with a length of 10 cm is immersed in water at 0 °C. An observer observes the ice cube from the water, and it seems to be 7.75 cm long. If the refractive index of water is 4/3, find the height of the ice cube immersed in the water. I could not understand how the apparent height of the ice cube in the water depends on the height of the ice cube immersed in the water. Does anyone have an...
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