1. The problem statement, all variables and given/known data Essentially, a particle is moving downward from the top of a tower at 0.98c, and the tower is moving up at 0.98c. I am to find the apparent height of the tower from the perspective of the particle 2. Relevant equations Δx=γ(Δx′+vΔt′) Δt=γ(Δt′+vΔx′/c2) Δx′=γ(Δx−vΔt) Δt′=γ(Δt−vΔx/c2) 3. The attempt at a solution I've tried to solve multiple ways and I think I just am getting the concept wrong and could use a hint- Essentially I figured if both frames are moving at .98c, then the apparent movement of the particle would be 2(.98c) if the tower frame would be fixed, and that I could solve it as a Galilean. The way I was told to solve it was by modifying the Lorentz formulae and frankly I'm having a brain fart figuring out my frames. I was also told c cannot be over 1, which made my original method not work.