In reference fram S\', Two protons, each moving at 0.51c, approach each other he

Question

In reference fram S', Two protons, each moving at 0.51c, approach each other head-on.

(a) Calculate the total kinetic energy of the two protons in frame S '.

(b) Calculate the total kinetic energy of the protons as seen in reference frame S, which is moving with one of the protons. ________MeV

I got 305 for part a but part b i cant seem to get. I wrote 625 but I got it wrong. Ive posted this question four times and everytime it's wrong. I also tried doing this problem numerous and I cant seem to get anywhere. Can someone please help me

Explanation / Answer

2) you are on one frame moving with same speed of proton. hence the other proton will be seen as coming towards you with a speed of 1.02c.

hence ke = 1/2*m*1.0404c^2 = 0.5202mc^2.

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