A$)$ In Figure $3,$ the only force acting on a $2\mathrm{.}0-kg$ object moving along the $x$ axis is shown. If the velocity $v_x$ is $+2\mathrm{.}0\frac{m}{s}$ at $t=0,$ what is the velocity at $t=4\mathrm{.}0s?$

gure $3.$

$6$ B$).$ A $1\mathrm{.}2-kg$ spring$-$activated toy bomb slides on a smooth surface along the $x-$axis with a speed of $0\mathrm{.}50\frac{m}{s}.$ At the origin $0,$ the bomb explodes into two fragments. Fragment $1$ has a mass of $0\mathrm{.}40$ kg and a speed of $0\mathrm{.}90\frac{m}{s}$ along the negative $y-$axis. The velocity vector of fragment $2$ makes an angle $$ with the positive x $-$axis as shown in Figure $4.$ What are the magnitude and direction of the velocity vector of fragment $2?$

e $4.$