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Severity: Notice

Message: Trying to access array offset on value of type null

Filename: models/Site_model.php

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Backtrace:

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File: /var/www/html/KOL/voice/application/controllers/Exitpage.php
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疑難雜症萬事通 - 一物體質量為5公斤靜止在光滑無摩擦的平面上今受50牛頓的水平力作用物體受力經歷5秒才停止施力試問經10秒後物體的動能為多少焦耳 - 前往 https://yamol.tw/item-38. （）如附圖所示，在光滑平面上有一質量為5公斤的靜止物體，受20牛頓的作用..-1689056.htm
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