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September 19, 2014

September 19, 2014

Posted by **MB** on Wednesday, March 2, 2011 at 2:07pm.

Thanks!

A 406-kg pile driver (the figure below) is raised 12 m above ground.

(a) How much work must be done to raise the pile driver? [Answer in KJ]

(b) How much work does gravity do on the driver as it is raised? [Answer in kJ]

(c) The driver is now dropped. How much work does gravity do on the driver as it falls? [Answer in kJ]

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