A space craft approaching earth launches an explorationvehicle followed by a las
ID: 1677666 • Letter: A
Question
A space craft approaching earth launches an explorationvehicle followed by a laser pulse. After the launch, an observer onearth sees the space craft approaching at a speed of 0.70c, theexploration vehicle approaching at a speed of 0.90c, and the laserpulse approaching at speed c. What is the speed of the explorationvehicle as viewed from the space craft?A space craft approaching earth launches an explorationvehicle followed by a laser pulse. After the launch, an observer onearth sees the space craft approaching at a speed of 0.70c, theexploration vehicle approaching at a speed of 0.90c, and the laserpulse approaching at speed c. What is the speed of the explorationvehicle as viewed from the space craft?
Explanation / Answer
speed of vehicle viewed from craft =0.2c/(1-0.63)=0.54c b speed of light in any frame of refernce is c
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