This problem can be solved using the conservation of momentum, which states that final moment = initial momentum. (keep in mind that momentum=mass*velocity)
Start off by writing down your variables: m1= 10.1g=0.0101kg, m2=2.92kg, v1=?, v2=0.597m/s.
Using the conservation of momentum we get(mass 2 is combined mass of the 2 b/c question states they stick together):
rearrange to get: v2=(m1+m2)*v2/m1