question_answer

  Two friends on roller skates are standing 5 m apart facing each other. One of them throws a ball of 2 kg towards the other, who catches it. How will this effect the position of the two? Explain.         

Answer:

                  Total initial momentum of the two friends is zero as both are at rest. When one person throws the ball towards the other and the other catches it, then the total linear momentum of both will have to be zero as no external force acts on them. Thus, both friends must move in opposite direction. Hence, the distance between both friends will increase.                                                   (1+1+1)