A ball B, of mass M moving northwards with velocity v collides elastically with another ball B of same mass but moving eastwards with the same velocity v. Which of the following statements will be true (a) B, comes to rest but B moves with velocity 2 v. (b) B, moves with velocity 2 v but B comes to rest. V (c) Both move with velocity- in north east direction. 2 (d) B, moves eastwards and B moves north wards.