Particles x (of mass 4 kg) and y (of mass 9 kg) move directly towards each otyher, collide and then separate. If `Deltav_(x)` is the change in the velocity of x and `Deltav_(y)` is the change in velocity of y then the magnitude of `(Deltav_(x))/(Deltav_(y))` is :
A. `(9)/(4)`
B. `(3)/(2)`
C. `(2)/(3)`
D. `(4)/(9)`
