Perfectly inelastic collision

In the above figure, two objects AA and BB with the same mass mm are 1515 m away from each other. Now, AA and BB are thrown horizontally at the same time at the velocities 2020 m/s and 10 -10 m/s, respectively, eventually colliding with each other in the air. If the two objects stick together after a perfectly inelastic collision, what is the speed of the mass at the moment of collision (in m/s)?

Assume that gravitational acceleration is g=10g= 10 m/s2^{2}.

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