What is the Speed of the Composite Particle After Collision?

[abcbeck88]

A particle A of mass 1.6kg collides with another particle B of mass 2.5kg. their initial velocities are u1=2.2i + 1j and u2=0.5i + 0.8j just before impact. After collision, they both merged and becoes a composite particle, which travel with a velocity of V.

calculate the spend |V| a scalar in m/s

stuck with this too! please help!

 

[wukunlin]

have you tried doing them in terms of i's and j's separately? that should solve it.

and
$$|V| = \sqrt{ V_x^2 + V_y^2 }$$