A golf ball with mass $m$ is dropped from a height $h_1$ onto a rigid surface and then rebounds to a height $h_2$. Its momentum immediately before impact is different from its momentum immediately after leaving the surface. What is the overall change in the momentum of the golf ball between these two moments? (Ignore air resistance.)
- A$m\sqrt{2gh_1}-m\sqrt{2gh_2}$
- B$m\sqrt{2gh_1}+m\sqrt{2gh_2}$
- C$m\sqrt{2g(h_1-h_2)}$
- D$m\sqrt{2g(h_1+h_2)}$