In Activity $21,$ immediately before the head$-$on collision Objects A $($mA $=6\mathrm{.}0$ kg$)$ has a velocity of $8\mathrm{.}0$ m$/$s to the right and Object B $($mB $=2\mathrm{.}0$ kg$)$ has a velocity of $16$ m$/$s to the left. Right after the collision, Object A has a velocity of $1\mathrm{.}0$ m$/$s to the right. What is the magnitude of the velocity of Object B immediately after the collision?

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A$.$

$12$ m$/$s

B$.$

$8\mathrm{.}0$ m$/$s

C$.$

$0$ m$/$s

D$.$

$5\mathrm{.}0$ m$/$s

E$.$

$6\mathrm{.}0$ m$/$s