A) 2.0 kJ
B) 3.0 J
C) 3.0 kJ
D) 3000 kJ
E) None of these
Correct Answer: B
Solution :
The work done by gravity is the work done, as if all the masses were concentrated at the centre of mass. The work necessary to lift the object can be thought of as the work done against gravity and is just W = mgh, where h is the height through which the centre of mass is iraised. \[W=(180\,kg)\,(9.8m\text{/}{{s}^{2}})(1.7\,m)=3.0\,kJ\]
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