If the two objects shown below collide and remain together without spinning, what will be the magnitude of their final velocity?

If the two objects shown below collide and remain together without spinning, what will be the magnitude of their final velocity?

If m1 = 5 kg, m2 = 10 kg, v1 = v2 = 10 m/s, and angle = 60 degrees. 

 52.2 m/s 

 -17.4 m/s 

 5.8 m/s 

 17.4 m/s 

 29.0 m/s

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