| 原帖由 EnTaSIa 於 23/4/2009 06:42 PM 發表 憑我僅餘的記憶 (a) KE =PE lost =mgh =60*10*(15-3.5) =6900 (b) Fs=Work done F=6900/(3.5-0.5) =2300 (c) When cushion is larger, 1)Less Kinetic Energy converted from PE 2)Larger displa ... (b)唔駛計埋mg咩... 我係答 Fs=Work done +mg F=6900/(3.5-0.5)+600 =2900 paper1...section b唔小心冇左好多分.... 最後一題又好似冇左3分,,, |
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