A) 75 joule
B) 60 joule
C) 50 joule
D) 100 joule
Correct Answer: A
Solution :
\[W=\frac{1}{2}Fl=\frac{1}{2}\times Mg\times l=\frac{1}{2}\times 5\times 10\times 3=75\ Joule\]
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