question_answer

  A cracker of mass 100 g explodes into two pieces of equal mass. Show that these two pieces of the cracker fly in opposite direction. 

Answer:

                    Mass of cracker ; Initially cracker is at rest, u = 0  Initial momentum of the cracker = mu =0  After explosion, mass of each piece Let          velocity of first piece and          velocity of second piece Momentum of cracker after explosion                              (1) According to law of conservation momentum,                                                     The negative sign shows that  and  are equal in magnitude and opposite in direction. Thus, two pieces of the cracker fly in opposite directions with same speed.                         (1)