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messier992

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## Homework Statement

A spaceship of proper length L is moving with respect to the ground with speed v. As measured on the ground, how much time does a light signal need to get from the front to the end of the spaceship.

## Homework Equations

L'=L/γ

t'=tγ

## The Attempt at a Solution

The right answer is L/[γ(c+v)]

I don't understand how to get the answer from either possibilites. Where, conceptually, I'm misunderstanding the equations.

Distance of Spaceship Viewed From the Ground

L'=L/γ = L/γ

t=L'/(velocity)= [L/γ]/(v+c)]

v+c? But isn't light supposed to travel at the same speed in all reference frames?

Additionally, how would I approach the question using the equation t'=tγ?

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