A point mass of 1 kg collides elastically with a stationary point mass of 5 kg. After…
Physics · JEE Advanced · NTA Exams — Work, Energy and Power
A point mass of 1 kg collides elastically with a stationary point mass of 5 kg. After their collision, the 1 kg mass reverses its direction and moves with a speed of 2 m s–1. Which of the following statement(s) is (are) correct for the system of these two masses?
- Total momentum of the system is 3 kg m s–1.
- Momentum of 5 kg mass after collision is 4 kg m s–1.
- Kinetic energy of the centre of mass is 0.75 J.
- Total kinetic energy of the system is 4 J.
Answer
(D) Total kinetic energy of the system is 4 J.
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