Physics

Problem

Object X (

m_X = 2.0\,\text{kg}

) moves

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

along a straight line and strikes stationary Object Y. After sticking together, the pair moves at

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

in the original direction of Object X. Determine the mass of Object Y.