FREE URANIUM(238) NUCLIE KEPT IN A TRAIN EMITS ALPHA PARTICLES.WHEN THE TRAIN IS STAIONARY AND A URANIUM NUCLEUS NUCLEUS DECAYS A PAASENGER MEASURES THAT THE SEPERATION BETWEEN THE ALPHA PARTICLE AND THE RECOILING NUCLEUS BECOME X IN THE TIME T AFTER THE DECAY .IF THE DECAY TAKE PLACE WHEN THE TRAIN IS MOVING AT UNIFORM SPEED AUNIFORM SPEED V THE DISTANCE BETWEEN THE ALPHA PARTICLE AND THE RECOIOLING NUCLEUS AT A TIME T AFTER THE DECAY AS MEASURED BY THE PASSENGER WILL BE-
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