Velma and Mort Pass Each Other, in Rocket Ships, at a Relative

question 108

Multiple Choice

Velma and Mort pass each other, in rocket ships, at a relative velocity of half of lightspeed. Velma has an ice cream cone which will melt in 5 minutes if not refrigerated. She removes her cone from the refrigerator, and allows it to melt. According to Mort, how long does it take for Velma's cone to melt?

• A) less than 5 minutes
• B) more than 5 minutes
• C) 5 minutes
• D) It could be either more than 5 minutes, or 5 minutes, depending on which observer is at rest.
• E) It is impossible to answer this question, because such measurements of moving objects have no precise meaning.

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