'न्यूटन का तृतीय नियम' (Newton's Third Law):

उत्तर: (D) प्रत्येक क्रिया की समान और विपरीत प्रतिक्रिया होती है — Action-reaction: always equal, opposite, on DIFFERENT bodies. Walking: foot pushes ground back → ground pushes foot forward. Rocket: gases pushed down → rocket pushed up. Swimming: hands push water ba...