Spacecraft A is moving at 0.90c with respect to the earth. If another spacecraft B is...

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Spacecraft A is moving at 0.90c with respect to the earth. If another spacecraft B is to pass A at a relative speed of 0.50c w.r.t. A in the same direction, then the speed B must have (in units of c) with respect to the earth is c (up to two decimal places). Spacecraft A is moving at 0.90c with respect to the earth. If another spacecraft B is to pass A at a relative speed of 0.50c w.r.t. A in the same direction, then the speed B must have (in units of c) with respect to the earth is c (up to two decimal places).

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