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
Answer: C
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A.
B. 
C. 
D. 
E. 
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What will be an ideal response?