A heavy meterstick has mass m. When the meterstick is thrown like ...

[laurencescou]

A heavy meterstick has mass m. When the meterstick is thrown like a spear past you at speed v, you measure its momentum to be 2mv. What do you measure its length to be?
 
  A) 1 m
  B) 0.87 m
  C) 0.5 m
  D) 0.25 m
  E) none of the above

Question 2

Relative to some reference frame in the universe, you may now be traveling at a speed
 
  A) faster than the speed of light.
  B) slower than the speed of light.
  C) at the speed of light.
  D) any of the above

[af]

Answer to Question 1

Answer: C

Answer to Question 2

Answer: B