Question

According to Newton's third law of motion every action has its equal and opposite reaction then why don't they cancel each other?

Can anyone tell....

Answer 1

Because they act on different body.
for example suppose two body A and B collied each other than A exert force on B and B exert force on A I.e they exert force on each other not on single body

HOPE IT WILL HELP

Answer 2

Action and reaction forces are equal and opposite but they are not balanced forces because they acts on different bodies.So,they do not cancel out each other.