Question

what is the third law of motion say every action have equal and opposite reaction but when we push the heavy truck but where is the reaction

Answer 1

According to Newton's third law of motion, forces always act in equal but opposite pairs. Another way of saying this is for every action, there is an equal but opposite reaction. This means that when you push on a wall, the wall pushes back on you with a force equal in strength to the force you exerted.