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ä¸è½çé«åº¦ä¸ºhï¼æ¤æ¶é度为v
ï¼1ï¼æ±ä¸è½h/2é«åº¦æ¶çé度åæç¨æ¶é´ï¼
æ ¹æ®h=v^2/(2g)ï¼v=æ ¹å·(2gh)
v':v=æ ¹å·(2gh/2)/æ ¹å·(2gh)==1:æ ¹å·2=æ ¹å·2/2
v'=væ ¹å·2/2
æ ¹å·v=gt,t=v/g
t':t=v':v=æ ¹å·2/2
t'=tæ ¹å·2/2
çï¼ä¸è½h/2é«åº¦æ¶çé度ï¼væ ¹å·2/2ï¼æç¨æ¶é´ï¼tæ ¹å·2/2
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æ ¹æ®h=1/2gt^2
h':h=(t/2)^2:t^2=1:4
h'=h/4
æ ¹æ®v=gt
v':v=(t/2):t=1:2
v'=v/2
çï¼ä»éæ¢å¼å§ä¸è½t/2æ¶é´çä¸è½é«åº¦ï¼h/4ï¼é度ï¼v/2
ï¼g=10m/s²ï¼
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