Fleas have remarkable jumping ability. A $0\mathrm{.}60$ mgflea, jumping straight up$,$ would reach a height of $40$ cm if there were no air resistance. In reality, air resistance limits the height to $20$ cm $.$

Part A

What is the flea's kinetic energy as it leaves the ground?

Express your answer with the appropriate units.

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K $=$

nothingnothing

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Part B

At its highest point, what fraction of the initial kinetic energy has been converted to potential energy?

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f $=$

nothing

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