Physics

Problem

A stationary

5\,\text{kg}

block on a frictionless track suddenly explodes into two fragments of mass

3\,\text{kg}

and

2\,\text{kg}

. The

2\,\text{kg}

fragment moves east at

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

. What is the speed and direction of the

3\,\text{kg}

fragment immediately after the explosion? a)

2.7\,\text{m\,s}^{-1}\text{ east}

6.0\,\text{m\,s}^{-1}\text{ west}

2.7\,\text{m\,s}^{-1}\text{ west}

1.3\,\text{m\,s}^{-1}\text{ west}