As measured from the Earth, a spacecraft is moving at speed c/2 toward a second spacecraft that is not moving. The first spacecraft emits a laser pulse toward the second spacecraft. What is the speed of the laser pulse measured by the second spacecraft as it passes by?

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The Answer of As measured from the Earth, a spacecraft is moving at speed c/2 toward a second spacecraft that is not moving. The first spacecraft emits a laser pulse toward the second spacecraft. What is the speed of the laser pulse measured by the second spacecraft as it passes by?

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