1. The problem statement, all variables and given/known data A plane is moving at a constant speed of 300m/s. If you are inside and you shine a light towards the back of the plane, how will light appear to move from the earths frame of reference? 2. Relevant equations None 3. The attempt at a solution Light always moves at 3x10^8 m/s so it would appear to be moving at the same speed for somebody inside the plane and somebody standing on the ground. I just have a question about time dilation. Which person will see the event happen the fastest? Because to me it would seem that the light would hit the back of the plane fastest to somebody on the ground. This is because once the light is fired, the back of the plane is moving towards the light beam for somebody on earth.