A point mass of 1 kg collides elastically with a stationary

Last updated: 7/10/2022

A point mass of 1 kg collides elastically with a stationary point mass of 5 kg. Aftr their collision, the 1 kg mass reverses its direction and moves with a speed of 2 m/s. Which of the following statemet(s) [IIT-JEE 2010] is (are) correct for the system of these two masses ? (A) Total momentum of the system is 3 kg m/s. (B) Momentum of 5 kg mass after collision is 4 kg m/s. (C) Kinetic energy of the centre of mass is 0.75 J. (D) Total kinetic energy of the system is 4 J.