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I need help with the last part about the momentum. I found answers A-D, but I...

I need help with the last part about the momentum. I found answers A-D, but I can't seem to get the last question. Thanks for your help in advance!

(A) Find the rest energy of a proton in units of electron volts. Answer: 938 MeV

(B) If the total energy of a proton is four times its rest energy, what is the speed of the proton? Answer: 2.90e^8 m/s

(C) Determine the kinetic energy of the proton in units of electron volts. Answer: 2810 MeV

(D) What is the proton's momentum? Answer: 3630 MeV/c

The kinetic energy of the proton is decreased to 1.44 GeV.

(a) What is the speed of the proton (in units of c)? Answer: 0.919c
(b) What is its momentum (in units of MeV/c)?

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