Don't get this, HELPPPP!

Question

Light travels through space at a speed of 3.0 108 m/s. A space probe is traveling toward Earth at 2.5 108 m/s when one of its spotlights is turned on. What speed would an observer on Earth measure for the light from the spotlight?
A. 2.5 108 m/s

B. 0.5 108 m/s

C. 3.0 108 m/s

D. 5.5 108 m/s

Answer 1

Amanda,

  Remember the answer from a previous question:

C. The speed of light in a vacuum is the same for all frames of reference.

So for this question the answer is ...

 

"Light travels through space at a speed of 3.0 108 m/s."

so, C.