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Lots Of Physics P2 Doubts- help?

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poisonedrose:

--- Quote from: zhr on June 07, 2010, 12:38:14 am ---OctNov08- 2(a)(i)(ii)

(a) (i) final speed=0
         initial speed=v
         a=0.85*9.81
         s=12.8
         v^2=2as
         v^2=2*0.85*9.81*12.8
             v=14.6m/s


    (ii) t=s/v
         t=29.3/14.6
         t=2s
        

--- End quote ---

OctNov(a)(i) Why do we use 12.8 and not 29.3 as the “s”value?

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