1. The problem statement, all variables and given/known data A muon traveling with negligible energy loss at v = 0.996c travels past a 4730m mountain. What is the relavitistic mass of the muon given the rest mass energy of 1.69 x 10^-11 joules??? 2. Relevant equations 3. The attempt at a solution I think I should be using relativistic mass = m/sqrt(1-v^2/c^2). So m = 1.69 x 10^-11, however im unsure how to imput the other values into the equation. The answer i need to find is 2.1 x 10^-27. Thanks for your help.