I have no real knowledge of physics beyond the very basics of classic Newtonian mechanics, but as far as I understand, when a particle moves closer to the speed of light, its "relativistic mass" becomes greater, which means it requires more and more energy to further accelerate it.
I was watching an anime called "One Punch Man", and in this anime there is a character, with absurd strength, that physically jumps from the Moon back to Earth. Watching that scene made me curious about the relativistic effects, and requirements, of such feat.
Considering that the Moon is +/- 1 lightsecond away from Earth, and that the trip took just a few seconds (10 seconds maybe?), it's safe to assume that the character achieved "relativistic speeds", right?
So, assuming that the character weights 70 kilograms, the trip took 10 seconds (from the characters perspective), and the character "crashes" into earth (does not de-accelerate upon entrance):
What speed did the character achieve?
How much energy did the character "consume" to perform the jump?
If the 10 seconds were measured from the perspective of someone on earth, how long did the trip took for the character?