$6.(1$ pt$.)$

At the instant a $2\mathrm{.}0-$kg particle has a velocity of $4\mathrm{.}0$ m$/$s in the positive & direction, a $4\mathrm{.}0-$kg particle has a velocity of $6\mathrm{.}0$ m$/$s in the positive y direction. What is the speed of the center of mass of the two$-$particle system?

$3\mathrm{.}8$ m$/$s

b$.$

$3\mathrm{.}4$ m$/$s

$5\mathrm{.}2$ m$/$s

d

ei

$4\mathrm{.}2$ m$/$s

$4\mathrm{.}8$ m$/$s