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John R.

Physics and Math Tutor – kind, easy-going, patient

Newport Beach, CA (92660)

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The potential energy of the pinecone before it drops is mgh (given the ground is used as the zero potential energy reference). After if falls the energy is all kinetic energy or (1/2)mv^2 Equating these gives v^2 = 2gh. Note that you can now determine the energy loss due to air friction by the difference...

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