高一物理题求高手助!!!求解释!!!
\u9ad8\u4e00\u7269\u7406\u9898\u6c42\u9ad8\u624b\u52a9!!!\u6c42\u89e3\u91ca!!!10 B \u5982\u679cC\u9009\u9879\u662f MF/(M+m)-uMg\u4e5f\u5bf9 17 \u5047\u8bbe\u9700\u8981\u7ecf\u8fc7t\u79d2\uff0c\u5219\u4eba\u7684\u4f4d\u79fbx1=4t
\u8f66\u7684\u4f4d\u79fbx2=10t-0.5*2*t*t x1=x2+7 4t=10t-t*t +7 t=7\u6216-1 t=7s\uff0c\u4f46\u662f\u7531\u4e8et=5s\u7684\u65f6\u5019\uff0c
\u6c7d\u8f66\u5df2\u7ecf\u505c\u4e86\uff0c\u6b64\u65f6\u4eba\u7684\u4f4d\u79fb\u4e3a20m \u8f66\u7684\u4f4d\u79fb\u4e3a25m\uff0c\u56e0\u6b64\u4eba\u79bb\u8f66\u7684\u8ddd\u79bb\u8fd8\u670925+7-20=12m
\u4eba\u7684\u901f\u5ea6\u8fd8\u9700\u8981\u65f6\u95f412/4=3s\uff0c\u56e0\u6b64\u4eba\u9700\u89818s\u8ffd\u4e0a
1 C \u5f53\u529b\u9010\u6e10\u51cf\u5c0f\uff0c\u5219\u52a0\u901f\u5ea6\u9010\u6e10\u589e\u5927\uff0c\u65b9\u5411\u4e0e\u8be5\u529b\u65b9\u5411\u76f8\u53cd\uff0c\u901f\u5ea6\u589e\u52a0\uff0c\u5e76\u4e14\u589e\u52a0\u53d8\u5feb\u3002\u5f53\u529b\u5230\u96f6\u65f6\uff0c\u52a0\u901f\u5ea6\u6700\u5927\u4e4b\u540e\uff0c\u52a0\u901f\u5ea6\u53c8\u5f00\u59cb\u51cf\u5c0f\uff0c\u4f46\u662f\u901f\u5ea6\u7ee7\u7eed\u589e\u52a0\uff0c\u53ea\u662f\u589e\u52a0\u53d8\u6162\uff0c\u5f53\u529b\u8fd8\u539f\uff0c\u5408\u529b\u4e3a\u96f6\uff0c\u901f\u5ea6\u8fbe\u5230\u6700\u5927\uff0c\u4e0d\u518d\u589e\u52a0
\u5bd2\u5047\u4f5c\u4e1a\u4e48~
3\u3001\u6613\u77e5\u662f\u5300\u52a0\u901f\u8fd0\u52a8\u3002\u4e0es=(1/2)at^2\u5bf9\u6bd4\uff0c\u9009C\u3002
\u5b66\u4e86\u5bfc\u6570\u4e4b\u540e\u53ef\u4ee5\u7528\u6c42\u5bfc\u505a\u3002
7\u3001\u753bv-t\u56fe\u3002\u9762\u79ef\u4ee3\u8868\u4f4d\u79fb\uff0c\u5bb9\u6613\u63a8\u5f97v1=v2\u3002\u8fd8\u662f\u56e0\u4e3a\u9762\u79ef\u4ee3\u8868\u4f4d\u79fb\uff0c\u6240\u4ee5\u53ef\u770b\u51fa\u4e2d\u95f4\u65f6\u523b\u65f6\u8fd8\u672a\u5230\u4e00\u534a\u4f4d\u79fb\uff0c\u6240\u4ee5v3=v2=v1\u3002
11\u30010\u548c1\u4e4b\u95f4\u7701\u75654\u4e2a\u70b9\uff0c\u4e5f\u5c31\u662f0\u548c1\u4e4b\u95f4\u67095\u6b21\u6253\u70b9\u95f4\u9694\uff0ct=0.02*5=0.1\u3002v\u5e73\u5747=x1/t\u3002
\u76f8\u90bb\u4e24\u6bb5\u4f4d\u79fb\u4e4b\u5dee\u25b3s\uff0c\u5176\u65f6\u95f4\u5deeT\uff0c\u6709\u516c\u5f0f\u25b3s=aT^2\u3002
\u6b64\u9898T=0.1\uff0cx4-x1=3\u25b3s\uff0c\u5219a=(x4-x1)/3T^2\u3002
B A D C A C A B 绝对是!!
答案如下 BC A B C AD C C B
2.BC
3.A
4.A
5.C
6.AC
7.C
8.A
9.B
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绛旓細鍐嶆湁S-X=95,鐢辨甯﹀叆鏁板姹傝В灏卞彲浠ヤ簡銆傝鏄垜娌＄畻閿欑殑璇漈=10锛岄偅涔 T-1=9s 2.(1) (2) (3)灏忛閮芥槸鐩存帴濂楀叕寮忕殑绛旀濡備笅 锛1锛5s (2)25m (3)12.5m (4)褰撴苯杞︾殑閫熷害杈惧埌5m/s 涔嬪墠鑷杞︿笌瀹冪殑璺濈鍦ㄧ缉灏忥紝褰撴苯杞﹂熷害澶т簬5m/s鏄紝姹借溅灏卞紑濮嬪暒寮鍜岃嚜琛岃溅鐨勮窛绂讳簡锛屾墍浠ュ綋鑷...
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