7:5 Work Done by Forces

• Work done by gravitational force
• Work done by spring force
• Work done by a variable force

Watch the video that explain the work done by the gravitational force then answer the question 

1. An elevator cab of mass m 500 kg is descending with speed vi 4.0 m/s when its supporting cable begins to slip, allowing it to fall with constant acceleration (Fig. 7-8a). (a) During the fall through a distance d 12 m, what is the work Wg done on the cab by the gravitational force?
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