agsa asked in Science & MathematicsPhysics · 2 months ago

# Physics Relativity Question?

A spaceship is travelling at 100,000,000 m/s relative to the Earth when someone at

the front of the ship turns on a flashlight. How fast do the people on the ship see the light travelling? How fast do people watching from Earth see the light travelling?

Relevance
• 2 months ago

"c" and "c" respectively ( approximately 3 * 10 ^ 8 m/s) ALL inertial observers measure the speed of light to be exactly the same.  That is the key tenet of special relativity.

• Dylan
Lv 6
2 months ago

All observers see light traveling at the exactly the same speed but there relative time is different, eg. 1 second for me could be 2 seconds for another observer.

• 2 months ago

The speed of light is 186,000 miles per second. It does not matter the speed of the object that it starts from or the speed of the object that sees it. What changes is the FREQUENCY. (Doppler shift) If the space ship is traveling toward you the doppler shift will be up, away from the doppler shift will be down.