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A pole AB of length 10 m weighs 800N and has its centre of gravity 4 m from the end A, ...

A pole AB of length 10 m weighs 800N and has its centre of gravity 4 m from the end A, and lies on horizontal ground.
The least vertical force required to lift its end B is ____________

A. 320N
B. 80N
C. 2000 N
D. 20 N





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