1.
A point mass of 1 kg1\,\text{kg} collides elastically with a stationary point mass of 5 kg5\,\text{kg}. After the collision, the 1 kg1\,\text{kg} mass reverses its direction and moves with a speed of 2 m/s2\,\text{m/s}. Which of the following statement(s) is (are) correct for the system of these two masses?

Note: More than one option may be correct.