Which of the following statements is true ? (i) A car of mass M is tied by one end of a massless rope of length 10 m. The other end of the rope is in the hands of a man of mass M. The entire system is on a smooth horizontal surface.The man is at x = 0 and the cart at x = 10 m. If the man pulls the cart by the rope, the man and the cart will meet at the point x = 5 m. (ii) Two spherical bodies of mass M and 5 M and radii R and 2 R, respectively , are released in free space with initial separation between their centers equal to 12 R. If they attract each other due to the gravitational force only , then the distance covered by the smaller body just before collision is 7.5 R. (iii) Two skaters A and B , having masses 40 kg and 60 kg , respectively stand facing each other 10 m apart on a horizontal smooth surface. They pull on a rope stretched between them , the distance covered by A, when skaters meet is 6 m. (iv) A ballon (mass M) is attached to light rope of length L. To the other end of the rope a boy (mass m) is hanging in air. The system is at rest. The distance travelled by the balloon (in downward direction) when the boy touches the ballon is (ML)/(M + m).