Work, Energy and Power - Medium

A point mass of

1\,\text{kg}

collides elastically with a stationary point mass of

5\,\text{kg}

. After the collision, the

1\,\text{kg}

mass reverses its direction and moves with a speed of

2\,\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.