Neutrinos are hard to detect because A) they experience only ...

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Neutrinos are hard to detect because
 
  A) they experience only the gravitational force.
  B) they move so fast.
  C) they experience only the weak force.
  D) they have such a small mass.
  E) All of the above.

Question 2

Mort, who is standing on the ground, throws a ball at 20 m/s eastward as measured by him. What is the ball's velocity relative to Velma, who is in a train moving eastward past Mort at 70 m/s?
 
  A) 50 m/s eastward
  B) 90 m/s eastward
  C) 50 m/s westward
  D) 90 m/s westward
  E) 70 m/s westward

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Answer to Question 1

C

Answer to Question 2

C

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Excellent

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YES! Correct, THANKS for helping me on my review