Aboulder is raised above the ground so that its potential energy relative to the ground is 20,000j. it is then dropped. what is its kinetic energy just before it hits the ground

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Answer the radiant sun;

Year  1936,  lehman predicted that the earths 'inner core' is solid. she observed that the seismic signals during her study were bent and did not pass through instead bouncing back. later it was confirmed that the earth's inner core was solid made up of nickel-iron and had a molten outer core.

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