1ãç±x=(1/2)gtˆ2å¾t=(2x÷g)ˆ(1/2)代å
¥æ°æ®æ±å¾t=10s
è½ä¸ä¸åæ¶é´çé度g*(t÷2)å¾50m/s
2ã设å¡é«x,è½å°æ¶é´t,åx=(1/2)gtˆ2,(1-16/25)s=(1/2)g(t-1)ˆ2
两å¼ç¸æ¯è§£å¾t=2.5s,x=(1/2)gtˆ2.x=31.25m
3ãH=(1/2)gtˆ2,H'=(1/2)gï¼t-4s)ˆ2;两å¼ç¸åå¾
H-H'=(1/2)gtˆ2-(1/2)gï¼t-4s)ˆ2=196M,解å¾H=240.1m,æ¶é´æ¯7s
éç©è¿å¨å°æé«ç¹ç¨æ¶ï¼10m/sï¼Ã·10m/sˆ2=1s
ç¶åèªç±è½ä½è¿å¨æç¨çæ¶é´æ¯t,x=(1/2)gtˆ2,x'=(1/2)g(1s)ˆ2=5m,
两å¼ç¸åæ¯175m,x-x'=(1/2)gtˆ2-5m=175m,解å¾t=6s
æ¬æéç©ç绳åçªç¶æäºï¼éç©å°è¾¾å°é¢æç¨çæ¶é´1s+6s=7s
è½å°é度gt=10m/sˆ2*6s=60m/s
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