Posted by **slien** on Tuesday, October 10, 2006 at 6:54pm.

The proper length of one spaceship is 5 times that of another. The two spaceships are travelling in the same direction and, while both are passing overhead, an Earth observer measures the two spaceships to be the same length. If the slower spaceship is moving with a speed of 0.300c, determine the speed of the faster spaceship. Ans in units of c.

I know the gamma formula, but how would i work here?

Yes.