A 3.00 kg object with an intial velocity of + 5.00 m/s in the postive X direction collides with and sticks to a 2.00 kg object with an intial velocity of -3.00 m/s in the negative Y direction. Find the final componet of velocity of the composite object.
Use the conservation of momentum here:
Intial momentum = final momentum
3*5 -2*3=5*v
solve for v.