pearsondigital.ilongman.com/files/productsearch/secsch... · 2011. 12. 21. · its kinetic energy...
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- pearsondigital.ilongman.com/files/productsearch/secSch... · 2011. 12. 21. · Its kinetic energy is — i x 2000* 2 60 x 60 2 ms air track rider rider
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