question_answer

  An apple falls from a tree because of gravitational attraction between the earth and apple. If  is the magnitude of force exerted by the earth on the apple and  is the magnitude of force exerted by apple on earth, then find the relation between and .

Answer:

                  From third law of motion, to every action, there is an equal and opposite reaction and they act on two different bodies, so  and  are equal.                                                 (1)