Which of the following is/are true?
(1) The frictional force acting by the plane on the block is zero
(2) The normal reaction force acting by the plane on the block is zero
(3) The resultant force acting on the block is zero
點解1同2係岩
但3係錯?
俾埋原因我呀...
唔該o酉你地!!!
^^
更新1:
嗯...我係做96 ce phy 既paper II 第八題... 佢既答案係C 而C既CHOICE 係 (1) AND (2) ONLY 所以我唔係好明白...
更新2:
我明白了...謝謝你們... 原來係我個份野印錯左答案... 將7同8既ans 調轉左...