two objects are moving in the xy plane . object a has a mass of 3.5 kb and has a velocity Va of 5.3 m/s at an angle of 30 degrees from the x-axis and object b has a mass of 1.9 kg and has a velocity Vb of6.2 m/s at an angle 0f 72 degrees from the x-axis. What is the total momentum of the system?