At the local radio controlled (RC) airfield, a 2.4 kg RC plane strikes a 1.2 kg aerial drone that is hovering stationary at an altitude of 9.6 m.  Just after the collision, the two aircraft are stuck together and moving to the east at 9 m/s at an altitude of 9.6 m. What is the speed (in m/s) of the plane just prior to the collision?

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