Space Lan

How fast is the spaceship going relative to you?

You observe a spaceship coming towards you at a high rate of speed. A clock on board the spaceship appears to be running about 2.5 times slower than your clock. How fast is the spaceship going relative to you?

Public Comments

1. Very, very, fast.
2. Read this: http://en.wikipedia.org/wiki/Time_dilation
3. t'=(t-xv/c^2)/sqrt(1-v^2/c^2) .9165c