With whose definition of knowledge does edmund gettier, the philosopher who challenged the tripartite definition of sentential knowledge, find to successfully state the necessary and sufficient conditions for someone's knowing a given proposition?

The sufficient conditions are given by Plato with definition of knowledge does Edmund Gettier.

Edmund Gettier published a 3-page paper which challenged the definition of knowledge which has been defined and accepted since Plato. According to Plato, to have knowledge of something the following conditions must be met: justification, truth and belief.  

This means that “justified true belief” also referred to as JTB defines knowledge of a claim. Gettier’s paper challenged this definition by presenting two examples which disproved the long-accepted definition of knowledge. One example showed that there are cases where one can have a justified true belief about something or claim without actually having knowledge of the same claim.                                                                        

it takes about 30 days for it to break down

another example of kinetic energy would be,

kinetic energy   >     moving energy

answer   >   letter choice (c),   a hammer falling off a table.

hope that !                                         : )