Question

You drop a rock down a well that is 31 m deep. How long does it take the rock to hit the bottom of the well?

Answer 1

t = d/v
d = 31
v = 9.8

Answer 2

If the rock is dropped from rest,
\[\color{green}{t = \sqrt{\frac{2 \Delta \vec{d}}{\vec{g}}}}\]

Answer 3

bennyboy489 is assuming that there is no acceleration, so his solution is incorrect.

Answer 4

ahhhh, ok, was under the assumption it was already falling