Physics

Problem

A helium atom of mass

m_{\text{He}} = 6.6\times10^{-27}\,\text{kg}

travels at

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

toward a stationary xenon atom of mass

m_{\text{Xe}} = 2.2\times10^{-25}\,\text{kg}

in a head-on elastic collision. Determine the speed and direction of the helium atom immediately after the collision.