Amuon exists for 2.00 ms when measured by an observer at rest with respect to the muon a cosmic ray creates a muon in the earth's upper atmosphere that travels towards the eart at 0.998c during its lifetime: a) how far does the muon say that it has traveled relative to earth? b) what is the lifetime of the muon as measured by an observer on earth? c) how far does an observer on earth say the muon has traveled?