A body of mass 20 gm moving with an initial velocity of ${\displaystyle 2m}{{\displaystyle s}}^{–\text{1}}$  collides with another body of mass 80 gm moving in opposite direction with velocity${\displaystyle 4}{\displaystyle m}{{\displaystyle s}}^{–\text{1}}$ . If the collision is perfectly inelastic, then after the collision.

the two bodies inter change their velocities

the two bodies combine and move with a common velocity of ${\text{2.8 ms}}^{–\text{1}}$  in the initial direction of heavier body

the two bodies combine and move with a common velocity of ${\text{2ms}}^{–\text{1}}$  in the initial direction of lighter body

the two bodies combine and move with a common velocity of $\text{5}.{\text{2 ms}}^{-\text{1}}$  in the initial direction of heavier body