Light Speed from Rocket's Perspective · CAP 2011 #8
Physics
Problem
A fast rocket travels directly upwards at 0.5c (half the speed of light). There is an explosion directly below the rocket. If astronauts manage to measure how fast the light produced by the explosion is moving relative to their spacecraft, they will find the light to be moving:
a) Upwards at speed 0.5c.
b) Upwards at speed c.
c) Upwards at speed 1.5c.
d) Downwards at speed 0.5c.
e) Downwards at speed c.