1. The problem statement, all variables and given/known data Prove that the group velocity of a wave packet is equal to the particle’s velocity for a relativistic free particle. 2. Relevant equations vgroup = Δω/Δk = dω/dk E = (h/2π)*ω = √(p2c2 + m2c4) 3. The attempt at a solution I'll be honest..I have no idea where to even begin with this problem. I know that vparticle = f*λ but I've got no idea how to begin besides that. If anyone could help with that it'd be great. Thanks!