【物理】速度

[楓色幻想 10]

:EThe driver of a car slams on the brackes when he sees a tree blocking the road .The car slow uniformly with an acceleration of -5.60 m/s^2 for 4.20s ,making straight skid marks 62.4 m long ending at the tree .With what speed does the car then strike the tree?

我怕我翻譯夠好，真抱歉><"

我卡在位移正負號的問題....?

哪一個高手可以指點。

謝謝。

[Vincent stay 10]

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此內容已被編輯, January 27, 2010 ,由 Vincent stay