如图所示，直杆长L₁=0.5m，圆筒高为L₂=3.7m．直杆位于 圆筒正上方H=0.8m处．直杆从静止开始做自由落体运动，并能竖直穿越圆筒．

试求（取g=10m/s²）

根据对话情景，填入恰当的单词。
A: Good morning! Can I help you?
B: Good morning! Yes, please. I think that this house is for ____ 
A: That's right.
B: May I have a look at it?
A: ____ . Come in, please.
B: How long have you lived here?
A:____  ten years. I have been here since 2001.
B: How much does it ____ ?
A: 8600 pounds.
B: That's a lot of ____ !
A: It's worth every penny of it.
B: I like it very much. But I can't____ yet. My wife must look at it first.
A: Women always have the last words.

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阅读课文《永久的悔》9～11段，回答小题。