如圖所示，固定的光滑斜面上有一木板，其下端與斜面上A點(diǎn)距離為L(zhǎng)。木板由靜止釋放，若木板長(zhǎng)度L，通過(guò)A點(diǎn)的時(shí)間間隔為；若木板長(zhǎng)度為2L，通過(guò)A點(diǎn)的時(shí)間間隔為。為（　?。?/title> <link rel="stylesheet" href="http://static.zujuanyi.com/artDialog/css/ui-dialog-2023.min.css"> <link rel="stylesheet" href="http://static.zujuanyi.com/artDialog/css/artDialog-skin-ot2-2023.min.css"> <link rel="stylesheet" href="http://static.zujuanyi.com/_local/s/css/zujuanw-0e93923da6.mini.css?20243dss1ax1h">  <link rel="stylesheet" href="http://static.zujuanyi.com/_local/s/vuelib-20241226155337/vue2Lib.css?v=20240125"> <style> u { text-underline-position: under; } .grecaptcha-badge { display: none; } .JV_list { min-height: 500px; } .t-dots { font-family: Arial, Helvetica, sans-serif; } .video_shade { position: fixed; width: 100%; height: 100%; top: 0; left: 0; background: #000; opacity: .7; filter: alpha(opacity=70); z-index: 1024; } .video-play-iframe { position: fixed; overflow: hidden; width: 980px; background: #1a1a1a none repeat 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href="/question?tree_type=category&xd=3&chid=6" class="pointer">高中物理</a> <span>/</span> <a href="javascript:;">單選題</a> </div> <div id="xbyqcxo" class="m-wrap g-cw cfx"> <div id="soo1n1f" class="w fl"> <div id="5pnqqlr" class="g-mn2"> <ul id="J_question_detail" > <li> <div id="cppgsnl" class="question-block"> <div id="izu99f3" class="q-mc"> <h1 class="q-tit"> 1. <a href="/paper/view-5396015.shtml" class="ques-origin a-pointer" target="_blank"> (2024高三上·南昌月考) </a> 如圖所示，固定的光滑斜面上有一木板，其下端與斜面上A點(diǎn)距離為L(zhǎng)。木板由靜止釋放，若木板長(zhǎng)度L，通過(guò)A點(diǎn)的時(shí)間間隔為<img class="mathml" src="http://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmrow%3E%3Cmi+mathvariant%3D%22normal%22%3E%CE%94%3C%2Fmi%3E%3Cmsub%3E%3Cmi%3Et%3C%2Fmi%3E%3Cmn%3E1%3C%2Fmn%3E%3C%2Fmsub%3E%3C%2Fmrow%3E%3C%2Fmath%3E" style="max-width:100%;vertical-align: middle;">；若木板長(zhǎng)度為2L，通過(guò)A點(diǎn)的時(shí)間間隔為<img class="mathml" src="http://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmrow%3E%3Cmi+mathvariant%3D%22normal%22%3E%CE%94%3C%2Fmi%3E%3Cmsub%3E%3Cmi%3Et%3C%2Fmi%3E%3Cmn%3E2%3C%2Fmn%3E%3C%2Fmsub%3E%3C%2Fmrow%3E%3C%2Fmath%3E" style="max-width:100%;vertical-align: middle;"><sub>。</sub><img class="mathml" src="http://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmrow%3E%3Cmi+mathvariant%3D%22normal%22%3E%CE%94%3C%2Fmi%3E%3Cmsub%3E%3Cmi%3Et%3C%2Fmi%3E%3Cmn%3E2%3C%2Fmn%3E%3C%2Fmsub%3E%3Cmo%3E%3A%3C%2Fmo%3E%3Cmi+mathvariant%3D%22normal%22%3E%CE%94%3C%2Fmi%3E%3Cmsub%3E%3Cmi%3Et%3C%2Fmi%3E%3Cmn%3E1%3C%2Fmn%3E%3C%2Fmsub%3E%3C%2Fmrow%3E%3C%2Fmath%3E" style="max-width:100%;vertical-align: middle;">為（　?。?p style="text-align:justify;"><img src="http://tikupic.21cnjy.com/ct20241o/a3/ad/a3ad6f6fccb86ab8519d4d88f96f07f8.png" width="190" height="99" style="max-width:100%;"></p> </h1> <div id="mmbtva8" class="exam-s"> <span id="drmdpin" class="op-item"><span id="r8b1jou" class="op-item-nut">A . </span><span id="n7xr5il" class="op-item-meat"><img class="mathml" src="http://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmrow%3E%3Cmo+stretchy%3D%22false%22%3E%28%3C%2Fmo%3E%3Cmsqrt%3E%3Cmn%3E3%3C%2Fmn%3E%3C%2Fmsqrt%3E%3Cmo%3E%E2%88%92%3C%2Fmo%3E%3Cmn%3E1%3C%2Fmn%3E%3Cmo+stretchy%3D%22false%22%3E%29%3C%2Fmo%3E%3Cmo%3E%3A%3C%2Fmo%3E%3Cmo+stretchy%3D%22false%22%3E%28%3C%2Fmo%3E%3Cmsqrt%3E%3Cmn%3E2%3C%2Fmn%3E%3C%2Fmsqrt%3E%3Cmo%3E%E2%88%92%3C%2Fmo%3E%3Cmn%3E1%3C%2Fmn%3E%3Cmo+stretchy%3D%22false%22%3E%29%3C%2Fmo%3E%3C%2Fmrow%3E%3C%2Fmath%3E" style="max-width:100%;vertical-align: middle;"></span></span> <span id="y9xjuqu" class="op-item"><span id="twdmeix" class="op-item-nut">B . </span><span id="ap08e2b" class="op-item-meat"><img class="mathml" src="http://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmrow%3E%3Cmo+stretchy%3D%22false%22%3E%28%3C%2Fmo%3E%3Cmsqrt%3E%3Cmn%3E3%3C%2Fmn%3E%3C%2Fmsqrt%3E%3Cmo%3E%E2%88%92%3C%2Fmo%3E%3Cmsqrt%3E%3Cmn%3E2%3C%2Fmn%3E%3C%2Fmsqrt%3E%3Cmo+stretchy%3D%22false%22%3E%29%3C%2Fmo%3E%3Cmo%3E%3A%3C%2Fmo%3E%3Cmo+stretchy%3D%22false%22%3E%28%3C%2Fmo%3E%3Cmsqrt%3E%3Cmn%3E2%3C%2Fmn%3E%3C%2Fmsqrt%3E%3Cmo%3E%E2%88%92%3C%2Fmo%3E%3Cmn%3E1%3C%2Fmn%3E%3Cmo+stretchy%3D%22false%22%3E%29%3C%2Fmo%3E%3C%2Fmrow%3E%3C%2Fmath%3E" style="max-width:100%;vertical-align: middle;"></span></span> <span id="fifozjy" class="op-item"><span id="b7micfs" class="op-item-nut">C . </span><span id="tyvwrdb" class="op-item-meat"><img class="mathml" src="http://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmrow%3E%3Cmo+stretchy%3D%22false%22%3E%28%3C%2Fmo%3E%3Cmsqrt%3E%3Cmn%3E3%3C%2Fmn%3E%3C%2Fmsqrt%3E%3Cmo%3E%2B%3C%2Fmo%3E%3Cmn%3E1%3C%2Fmn%3E%3Cmo+stretchy%3D%22false%22%3E%29%3C%2Fmo%3E%3Cmo%3E%3A%3C%2Fmo%3E%3Cmo+stretchy%3D%22false%22%3E%28%3C%2Fmo%3E%3Cmsqrt%3E%3Cmn%3E2%3C%2Fmn%3E%3C%2Fmsqrt%3E%3Cmo%3E%2B%3C%2Fmo%3E%3Cmn%3E1%3C%2Fmn%3E%3Cmo+stretchy%3D%22false%22%3E%29%3C%2Fmo%3E%3C%2Fmrow%3E%3C%2Fmath%3E" style="max-width:100%;vertical-align: middle;"></span></span> <span id="rtv8xqc" class="op-item"><span id="anktmo8" class="op-item-nut">D . </span><span id="pn4hqk6" class="op-item-meat"><img class="mathml" src="http://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmrow%3E%3Cmo+stretchy%3D%22false%22%3E%28%3C%2Fmo%3E%3Cmsqrt%3E%3Cmn%3E3%3C%2Fmn%3E%3C%2Fmsqrt%3E%3Cmo%3E%2B%3C%2Fmo%3E%3Cmsqrt%3E%3Cmn%3E2%3C%2Fmn%3E%3C%2Fmsqrt%3E%3Cmo+stretchy%3D%22false%22%3E%29%3C%2Fmo%3E%3Cmo%3E%3A%3C%2Fmo%3E%3Cmo+stretchy%3D%22false%22%3E%28%3C%2Fmo%3E%3Cmsqrt%3E%3Cmn%3E2%3C%2Fmn%3E%3C%2Fmsqrt%3E%3Cmo%3E%2B%3C%2Fmo%3E%3Cmn%3E1%3C%2Fmn%3E%3Cmo+stretchy%3D%22false%22%3E%29%3C%2Fmo%3E%3C%2Fmrow%3E%3C%2Fmath%3E" style="max-width:100%;vertical-align: middle;"></span></span> </div> </div> </div> </li> </ul> <div style="height:20px;background-color: #fff;margin-top:1px"></div>  <div class="r0bttyl" id="J_ConnectQuestionsdBox"> </div> </div> </div> <div id="5ah3bel" class="g-sd2">  <div style="background:#fff;padding:20px 0;margin-bottom:20px;text-align:center;"> <img src="/question/paper-qrcode?id=59118347" width="140px" height="140px" alt=""> <p 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