A cosmic-ray proton is moving at such a speed that it can, Ask an Expert

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A cosmic-ray proton is moving at such a speed that it can travel from the Moon to Earth in 1.5s.

a) At what fraction of the speed of light is the proton moving?

b) What is it's kinetic energy? c) What value would be measured for its mass by an observer in Earth's reference frame? (the Earth-Moon distance is 3.8*10^5km. Ignore Earth's rotation)

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