A) \[mgR\frac{n}{n-1}\]
B) nmgR
C) \[mgR\frac{{{n}^{2}}}{{{n}^{2}}+1}\]
D) \[mgR\frac{n}{n+1}\]
Correct Answer: D
Solution :
\[\Delta U=\frac{mgh}{1+\frac{h}{R}}=\frac{mg\,nR}{1+\frac{nR}{R}}=\frac{nm\,gR}{n+1}\]
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