{"id":11837,"date":"2014-03-17T15:41:28","date_gmt":"2014-03-17T15:41:28","guid":{"rendered":"https:\/\/www.acasinhadamatematica.pt\/?p=11837"},"modified":"2022-01-25T00:57:39","modified_gmt":"2022-01-25T00:57:39","slug":"uma-particula-move-se-sobre-uma-reta","status":"publish","type":"post","link":"https:\/\/www.acasinhadamatematica.pt\/?p=11837","title":{"rendered":"Uma part\u00edcula move-se sobre uma reta"},"content":{"rendered":"<p><ul id='GTTabs_ul_11837' class='GTTabs' style='display:none'>\n<li id='GTTabs_li_0_11837' class='GTTabs_curr'><a  id=\"11837_0\" onMouseOver=\"GTTabsShowLinks('Enunciado'); return true;\"  onMouseOut=\"GTTabsShowLinks();\"  class='GTTabsLinks'>Enunciado<\/a><\/li>\n<li id='GTTabs_li_1_11837' ><a  id=\"11837_1\" onMouseOver=\"GTTabsShowLinks('Resolu\u00e7\u00e3o'); return true;\"  onMouseOut=\"GTTabsShowLinks();\"  class='GTTabsLinks'>Resolu\u00e7\u00e3o<\/a><\/li>\n<\/ul>\n\n<div class='GTTabs_divs GTTabs_curr_div' id='GTTabs_0_11837'>\n<span class='GTTabs_titles'><b>Enunciado<\/b><\/span><\/p>\n<p><a href=\"https:\/\/www.acasinhadamatematica.pt\/wp-content\/uploads\/2014\/03\/11-2-pag88-2.gif\"><img loading=\"lazy\" decoding=\"async\" data-attachment-id=\"11838\" data-permalink=\"https:\/\/www.acasinhadamatematica.pt\/?attachment_id=11838\" data-orig-file=\"https:\/\/www.acasinhadamatematica.pt\/wp-content\/uploads\/2014\/03\/11-2-pag88-2.gif\" data-orig-size=\"296,305\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;}\" data-image-title=\"Anima\u00e7\u00e3o\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/www.acasinhadamatematica.pt\/wp-content\/uploads\/2014\/03\/11-2-pag88-2.gif\" class=\"alignright wp-image-11838 size-full\" src=\"https:\/\/www.acasinhadamatematica.pt\/wp-content\/uploads\/2014\/03\/11-2-pag88-2.gif\" alt=\"Anima\u00e7\u00e3o\" width=\"296\" height=\"305\" \/><\/a>Uma part\u00edcula move-se sobre uma reta de forma que, ap\u00f3s $t$ segundos, ela encontra-se a $s\\left( t \\right) = 2{t^2} + 3t$ metros da sua posi\u00e7\u00e3o inicial.<\/p>\n<ol>\n<li>Determine a posi\u00e7\u00e3o da part\u00edcula ap\u00f3s $2$ s.<\/li>\n<li>Determine a posi\u00e7\u00e3o da part\u00edcula ap\u00f3s $3$ s.<\/li>\n<li>Calcule a velocidade m\u00e9dia da part\u00edcula no intervalo de tempo $\\left[ {2,3} \\right]$ (em segundos).<\/li>\n<li>Calcule a velocidade instant\u00e2nea em $t = 2$ s.<\/li>\n<\/ol>\n<p><div class='GTTabsNavigation' style='display:none'><span class='GTTabs_nav_next'><a href='#GTTabs_ul_11837' onClick='GTTabs_show(1,11837)'>Resolu\u00e7\u00e3o &gt;&gt;<\/a><\/span><\/div><\/div>\n\n<div class='GTTabs_divs' id='GTTabs_1_11837'>\n<span class='GTTabs_titles'><b>Resolu\u00e7\u00e3o<\/b><\/span><!--more--><\/p>\n<blockquote>\n<p>\\[s\\left( t \\right) = 2{t^2} + 3t\\]<\/p>\n<\/blockquote>\n<ol>\n<li>Ap\u00f3s $2$ s, a part\u00edcula encontra-se a $s\\left( 2 \\right) = 2 \\times {2^2} + 3 \\times 2 = 14$ m da posi\u00e7\u00e3o inicial.<br \/>\n\u00ad<\/li>\n<li>Ap\u00f3s $3$ s, a part\u00edcula encontra-se a $s\\left( 3 \\right) = 2 \\times {3^2} + 3 \\times 3 = 27$ m da posi\u00e7\u00e3o inicial.<br \/>\n\u00ad<\/li>\n<li>A velocidade m\u00e9dia da part\u00edcula no intervalo de tempo $\\left[ {2,3} \\right]$ (em segundos) \u00e9 ${v_{{m_{\\left[ {2,3} \\right]}}}} = \\frac{{s\\left( 3 \\right) &#8211; s\\left( 2 \\right)}}{{3 &#8211; 2}} = 27 &#8211; 14 = 13$ m\/s.<br \/>\n\u00ad<\/li>\n<li>A velocidade no instante $t = 2$ \u00e9 $v\\left( 2 \\right) = s&#8217;\\left( 2 \\right) = 4 \\times 2 + 3 = 11$ m\/s, pois $s&#8217;\\left( t \\right) = 4t + 3$.<\/li>\n<\/ol>\n<p style=\"text-align: center;\"><script src=\"https:\/\/cdn.geogebra.org\/apps\/deployggb.js\"><\/script>\r\n<div id=\"ggbApplet\" style=\"margin: 0 auto;\"><\/div>\r\n<script>\r\nvar parameters = {\r\n\"id\": \"ggbApplet\",\r\n\"width\":386,\r\n\"height\":500,\r\n\"showMenuBar\":false,\r\n\"showAlgebraInput\":false,\r\n\"showToolBar\":false,\r\n\"customToolBar\":\"0 39 59 || 1 501 67 , 5 19 , 72 | 2 15 45 , 18 65 , 7 37 | 4 3 8 9 , 13 44 , 58 , 47 || 16 51 64 , 70 | 10 34 53 11 , 24  20 22 , 21 23 | 55 56 57 , 12 || 36 46 , 38 49 50 , 71 | 30 29 54 32 31 33 | 17 26 62 , 14 66 68 | 25 52 60 61 || 40 41 42 , 27 28 35 , 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