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Please help! specially with Parts C and D a) At what fraction of c must a...

Please help! specially with Parts C and D

a) At what fraction of c must a particle move so that its kinetic energy is double its rest energy?
b) An electron’s velocity is 5*107 [m/s]. How much energy is needed to double the speed? To raise the speed to 99% of c?
c) How does an observer in frame S’ that moves with 0.5c along the direction of motion of the electron view the situation?
d) How does an observer in frame S’ that moves with 0.5c perpendicular to the direction of motion of the electron view the situation?

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