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å¨æå¤§é«åº¦æ¶æ»éåº¦ä¸ºåç´éåº¦: $ v = v_y = 0 \, ext{m/s} $ ï¼å ä¸º $ v_y = 0 $)

February 22, 2026

$å¨æå¤§é«åº¦æ¶æ»éåº¦ä¸ºåç´éåº¦: $ v = v_y = 0 \, ext{m/s} $ ï¼å ä¸º $ v_y = 0 $)$

ä¸ä¸ªæå°ä½ä»¥ 45 åº¦è§ä»¥ 20 m/s çåéåº¦åå°ãä¸èèç©ºæ°é»åï¼æå°ä½å¨å¶è½¨è¿¹æå¤§é«åº¦æ¶çéåº¦æ¯å¤å°ï¼ï¼ä½¿ç¨ $ g = 9.8 \, ext{m/s}^2 $ï¼
æå¤§é«åº¦æ¶çåç´éåº¦åéä¸ºé¶: $ v_y = 0 $
åéåº¦çæ°´å¹³ååç´åéç¸ç: $ v_{x} = v \cdot \sin(45^\circ) = 20 \cdot rac{\sqrt{2}}{2} = 10\sqrt{2} \, ext{m/s} $
#### 0 m/s
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ææ£éé¢: $ 0.30 imes 70 = 21 $