As Measured from the Earth,a Spacecraft Is Moving at Speed

question 48

Multiple Choice

As measured from the Earth,a spacecraft is moving at speed 0.80c toward another spacecraft moving at speed 0.60c in the same direction,i.e. ,the first spacecraft is catching up with the second spacecraft.What is the speed of the first spacecraft as viewed from the second spacecraft?

• A)0.38c
• B)-0.20c
• C)-0.38c
• D)not given

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