Suppose a particle called a kaon is created by cosmic radiation
striking the atmosphere.
c = 0.79 c
t = 1.225 × 10-8 s
It moves by you at 0.79c, and it lives 1.225 ×
10-8 s when at rest relative to an observer. How
long does it live, in seconds, as you observe it?
Δt = ?