Posted by jack on Monday, March 19, 2012 at 1:45pm.
The definition of work is (force) x (distance moved in the direction of the force)
(a) In this case, the force is M*g.
I assume that you know the value of g.
M is the mass. Complete the calculation.
(b) Change the sign of the previous answer. Negative work is done by whatever is lowering the weight.
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