A) \[{{h}_{1}}+{{h}_{2}}-g{{\left( \frac{\ell }{v} \right)}^{2}}\]
B) \[{{h}_{1}}-{{h}_{2}}-g{{\left( \frac{\ell }{v} \right)}^{2}}\]
C) \[{{h}_{1}}+{{h}_{2}}-g{{\left( \frac{\ell }{v} \right)}^{1/2}}\]
D) \[\frac{{{h}_{1}}+{{h}_{2}}}{2}-g{{\left( \frac{\ell }{v} \right)}^{2}}\]
Correct Answer: A
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