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[Phy] 2 Mechnanics Question [hard]

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2 Mechnanics Question [hard]

Can anyone show me the correct calculations/explanations for the questions?
Q 30 and 32

Thanks!
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第一題係咪OUT C?
第2題係D...

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唔知.....本野係for呢個syl...

點解32 係d???

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F - f = mBa > 0
F > f

f = mAa

(F - f) / f = mBa/mAa = mB/mA

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唔係幾明 why F - f = mBa > 0...

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引用:
原帖由 jason200584 於 2010-4-18 01:50 PM 發表
唔知.....本野係for呢個syl...

點解32 係d???
the horizontal change of momentum would not affect the vertical velocity

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回覆 #6 MCWOODY 的帖子

however, does Jack have any mass?

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these two questions seem to be strange( or maybe my concepts are not clear ...)

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32 i think it is C...
by the conservation of momentum....

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no...the answer for Q30 is C and Q32 is D....

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