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[" A particle which is experiencing a force,given by "bar(F)=3bar(1)-12bar(j)" ,undergoes a displacement "],[" of "bar(d)=4bar(i)" .If the particle had a kinetic energy of "3" Jat the beginning of the displacement,"],[" what is its kinetic energy at the end of the displacement? "],[[" (A) "9J," (B) "12K],[" (C) "10" J "," (D) "15" J "]]

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