Question

Could use a little help, relativity.

Answer 1

A rocket ship of proper length \(l_0\) travels at constant velocity \(v \) relative to a frame S. The nose of the ship \((A')\) passes the point \(A \) in S at \(t=t'=0\), and at this instant a light signal is sent from \(A'\) to \(B'\).

Answer 2

Here's my figure the time \[t' = \frac{ l_0 }{ c }\] for the sginal to reach the tail B' of the ship.

My question is, at what time \(t_1\), as measured in S, does the signal reach the tail \(B'\) of the ship.