![A ball of mass 3 kg moving with a velocity of 4 m/s undergoes a perfectly-elastic direct-central impact with a stationary ball of mass m.](https://www.gkseries.com/blog/wp-content/uploads/2023/09/A-ball-of-mass-3-kg-moving-with-a-velocity-of-4-m-s-undergoes-a-perfectly-elastic-direct-central-impact-with-a-stationary-ball-of-mass-m.jpg)
Q. A ball of mass 3 kg moving with a velocity of 4 m/s undergoes a perfectly-elastic direct-central impact with a stationary ball of mass m. After the impact is over, the kinetic energy of the 3 kg ball is 6 J. The possible value(s) of m is/are
(A) 1 kg only (B) 6 kg only (C) 1 kg, 6 kg (D) 1 kg, 9 kg
Ans: 1 kg, 9 kg