Witch point did the skater move faster?

why did the skater move fast at this point?

     It would be right where the hill started because there is motion and force starting to form making the skater move faster. The skater moved fast because of the motion.

Explanation:

when [oh-] is 10-5  m, and [h3o+] is 10-9  m, the poh is 5 and ph is 9. again in both cases the sum of ph and poh is 14. however, the hydrogen ion concentration is not always going to be equal to exactly 1 x 10 raised to a negative number. for example, we skipped over the value of 2.0 x 10-7.