How fast is the police car moving relative to the earth

Reference no: EM13555362

A law enforcement officer in an intergalactic "police car" turns on a red flashing light and sees it generate a flash every 1.3 s. A person on earth measures that the time between flashes is 2.5 s. How fast is the "police car" moving relative to the earth?

Reference no: EM13555362

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