You're an investigator for the National Transportation Safety Board, examining a subway accident in which a train going at 88 km/h collided with a slower train traveling in the same direction at 22 km/h . Your job is to determine the relative speed of the collision, to help establish new crash standards. The faster train's "black box" shows that it began negatively accelerating at 2.2 m/s2 when it was 42 m from the slower train, while the slower train continued at constant speed. What do you report?
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