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OpenStudy (anonymous):

Two identical bal ls are thrown from the top of a cliff, each with the same speed. One is thrown straight up, the other straight down. How do the kinetic energies and speeds of the balls compare as they strike the ground

OpenStudy (ybarrap):

Since the velocities at point 2 and 3 in the diagram below are equal, then the velocities of both cases when they hit the ground will also be equal since they fall the same distance: |dw:1394328168898:dw|

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