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!!!