(Solved): An object with a mass of 3kg and a speed of 2m/s collides with another ob ...

​​​​​​​

An object with a mass of $3\mathrm{kg}$ and a speed of $2\mathrm{m}/\mathrm{s}$ collides with another object with a mass of $9\mathrm{kg}$ and a speed of $1\mathrm{m}/\mathrm{s}$ while moving in the same direction. After the collision, it continues its speed of $9\mathrm{kg}$ at a speed of $2\mathrm{m}/\mathrm{s}$. What is the speed of the $3\mathrm{kg}$ object immediately after the collision? $\begin{array}{l}4\mathrm{m}/\mathrm{s}\\ 3\mathrm{m}/\mathrm{s}\\ -2\mathrm{m}/\mathrm{s}\\ 5\mathrm{m}/\mathrm{s}\\ -1\mathrm{m}/\mathrm{s}\end{array}$