Chapter 9.2, Problem 1CE

In Example 9–3, what result would you get if (a) $m_{\text{B}}=3m_{\text{A}}$. (b) m_B is much larger than $m_{\text{A}}\left(m_{\text{B}}\gg m_{\text{A}}\right)$, and (c) $m_{\text{B}}\ll m_{\text{A}}$?