You are standing on the rim of a canyon, you drop a rock and in 7.0 seconds hear the sound pof it hitting the bottom, how deep is the canyon ? what assumptionsdid you make? examine how each assump[tion affects the answer. does it lead to a larger or smaller depth than the calculated depth

This should help you with your question:

Gravitational pull = 9.8 m/s^2

1/2 x 9.8 x 7^2 = 240.1 m

The rock has fallen 240.1 m.

I cannot help you with the rest, but this should give you a headstart.

your parents i think this could be it

the ratio of the conjugate base to the acid required to attain the desired ph.