Physics

Problem

2\,\text{kg}

block moving at

5\,\text{m s}^{-1}

collides head-on with a

3\,\text{kg}

block moving at

2\,\text{m s}^{-1}

in the opposite direction. After the impact the two blocks stick together. The loss of kinetic energy in the collision is a)

31\,\text{J}

54\,\text{J}

29\,\text{J}

19\,\text{J}