Three objects A, B and C are kept in a straight line on a frictionless horizontal surface. These have masses m, 2 m and m respectively. The object A moves towards B with a speed 9 m/s and makes an elastic collision with it. Thereafter, B makes completely inelastic collision with C. All motion occur on the same straight e. Find final speed of the object C (A) 3 m/s (B) 4 m/s (C) 5 m/s (D) 1 m/s
