A positive kaon (k* ) has a rest mass of 494 mev/cz, whereas a proton has a rest mass of 938 mev/c*. if a kaon has a total energy that is equal to the proton re

A positive kaon (K* ) has a rest mass of 494 MeV/cz, whereas a proton has a rest mass of 938 MeV/c*. If a kaon has a total energy that is equal to the proton rest energy, the speed of the kaon is most nearly (1) 0-4Oc (2) 0-55c (3) 0.7Oc (4) 0 85c