Question on Third law of motion.

[yaseen shah]

Acc: to the third law of motion.
if one body acts force on another body then another body acts same force on it.
Ex:One block hits another block.so they apply force on each other

My question is that!
why block not cames to rest.and for small interval it has some vel:.

 

[GetPhysical]

They still apply the same force. The only thing is the block that was moving initially is carrying momentum when it collides with the second.