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physics

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A pile driver of mass 1000kg,hits a post 3m below it.It moves the post 10mm.Assuming gravity=10m/s,what is the kinetic energy of the pile driver?

  • physics - ,

    When it hits, the KE is the potential energy loss while falling 3 meters,
    1000*10*3 = 30,000 J
    How far it moves the post does not matter.

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