gōng
achievement
Phonosemantic compound. 力 represents the meaning and 工 represents the sound.
Evolution

Bronze script
Late Warring States (~250 BC)
Seal script
Shuowen (~100 AD)
Clerical script
Wu (Three Kingdoms: 222-280 AD)Regular script
ModernDefinitions
gōng
achievement, merit, good result; meritorious deed or service; achievement; result; service; accomplishment; work (physics)
Sources