Sitting at the top of the steep hill on the rollercoaster (not moving) is an example of A. Velocity
B. Speed
C. Acceleration
D. Inertia

It's Inertia because someone is sitting there and

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hello, i am papaguy.

i have found an answer to your question but use it as information.

information: because weak acids/bases have low concentration of hydrogen ions, the addition of water has a large impact on the ph. 2. a difference in 1 unit is a 10x difference in concentration for example; a liquid with ph of 3 is 10x more acidic than a liquid with a ph of 4. therefore, a liquid with a ph of 3 is stronger.

best of luck!