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A1300 kg aircraft going40 m/s collides with a3000 kg aircraft that is parked and they stick together after the collision and are going12.1 m/s after

A1300 kg aircraft going40 m/s collides with a3000 kg aircraft that is parked and they stick together after the collision and are going12.1 m/s after the collision. If they skid for 145.4 m before stopping, how long (in seconds) did they skid? Hint: Are the aircraft moving at a constant velocity after the collision or do they experience an acceleration?

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