Two masses of $0.1\;kg$ and $0.4 \;kg$ move towards each other with velocities $1 m/s$ and $0.1 m/s$ respectively. After collision they stick together . In 10 seconds the combined mass travels

Question

\[(a)\;120\;m \quad (b)\;0.12\;m\quad (c)\; 12 \;m \quad (d)\;1.2\;m\]