4.
骞虫姏涓庡渾鍛ㄨ繍鍔ㄧ粍鍚堥棶棰?/p>
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1
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涓寸晫鐐瑰垎鏋愶細
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2
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鍔紟鑻ヤ负鍦嗗懆杩愬姩锛?/p>
搴旀槑纭槸姘村钩闈㈢殑鍖�閫熷渾鍛ㄨ繍鍔紝杩樻槸绔栫洿骞抽潰鐨勫彉閫熷渾鍛ㄨ繍鍔紝
鏈烘
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杩樻槸绫诲钩鎶涜繍鍔紝鍨傜洿浜庡垵閫熷害鏂瑰悜鐨勫姏
鏄摢涓姏锛?/p>
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1]
濡傚浘鎵�绀轰负绔栫洿鏀剧疆鐨勫洓鍒嗕箣涓�鍏夋粦鍦嗗姬杞ㄩ亾锛?/p>
O
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R
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0.8
m
锛?
OA
姘村钩銆?/p>
OB
绔栫洿锛庤建閬撳簳绔窛姘村钩鍦伴潰鐨勯珮搴?/p>
h
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0.8
m
锛庝粠杞ㄩ亾椤剁
A
鐢遍潤姝㈤噴鏀句竴涓川
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m
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0.1
kg
灏忕悆锛屽皬鐞冨埌杈捐建閬撳簳绔?/p>
B
鏃讹紝鎭板ソ涓庨潤姝㈠湪
B
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m
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C
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0.4 m
锛庡拷鐣ョ┖姘旈樆鍔涳紝
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10 m/s
2
.
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A
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mgR
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1
2
mv
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1
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4 m/s
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h
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1
2
gt
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t
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0.4 s
姘村钩鏂瑰悜涓婃湁锛?/p>
x
锛?/p>
v
2
t
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v
2
锛?/p>
1 m/s
(3)
涓ょ悆纰版挒锛岃瀹氬悜宸︿负姝ｆ柟鍚戯紝鏍规嵁鍔ㄩ噺瀹堟亽瀹氬緥寰楋細
m
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(
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m
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)
v
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m
2
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3
m
1
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3
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0.3 kg