Which of the following travel at or very near lightspeed? A) ...

[Chloeellawright]

Which of the following travel at or very near lightspeed?
 
  A) photon
  B) neutrino
  C) Both of the above.
  D) Z particle
  E) All of the above.

Question 2

Velma is in a train moving eastward at 70 m/s. She throws a ball toward the rear of the train, throwing it at her normal throwing speed of 20 m/s. The ball's velocity relative to Mort, who is standing beside the tracks, is
 
  A) 50 m/s westward.
  B) 90 m/s eastward.
  C) 20 m/s eastward.
  D) 50 m/s eastward.
  E) 20 m/s westward.

[jamesnevil303]

Answer to Question 1

C

Answer to Question 2

D