The pion has an average lifetime of 26.0ns when at rest. For it to travel 10.0m, how fast must it move?
Lorentz velocity transformation?
The Attempt at a Solution
I'm very lost... am I supposed to use u'x = (ux-v)/(1-vux/c2)? I thought I was following the lecture pretty well, but now that I'm trying to solve a problem, I have no idea what to do.
After some more poking around, I used Δt=γΔt'. Now I have one equation and two unknowns (v and Δt). I know I am supposed to use a velocity equation to find v now, but I'm still not sure which eqn to use, and how.