関連ワード:  give an example of positive and negative work done    give an example of positive negative and zero work done    give one example of positive and negative work done    define work done by force give an example of positive and negative work done    example of positive and negative work done    give one example of positive negative and zero work done    give two examples of positive work done and negative work done    give two examples of positive negative and zero work done    give an example of each negative work done and positive work done    give one example each of positive negative and zero work done  
結果 : give an example of positive and negative work done