What is the correct answer?
4
A. [c²/(1 + 2c)] (m + M) g.h
B. [2c²/(1 + 2c)] (m + M) g.h
C. [3c²/(1 + 2c)] (m + M) g.h
D. [4c²/(1 + 2c)] (m + M) g.h