When a teacher hits a child ,according to newton's 3rd law both should get equally hurt ,but practically the child gets more hurt than the teacher. WHY?Plzzz explain..

According to Newtons third law the action as equal to the reaction. The force applied on the hand of the child is equal to the reaction applied by the child on the teacher's hand. Now the child's hand is much softer than that of a adult. That is the reason the child gets hurt more than the teacher do.