50 ~ Points A rock is held steady over a well and dropped. 2.6 seconds later, the sound of the rock hitting water is heard. Sound travels at a constant speed of 349 m/s. How deep is the well?

The well is deep.

If you use the kinematic equation (given what values your given)
deltaX= V_i(t) + 1/2(g)(t)^2
Delta x is distance or height, vi is velocity, g is gravity since the rock is let go the only acceleration acting on it is due to gravity and time is given to be 2.6s till the rock hits the water.

Plug in your values.
X = (349)(2.6) + (0.5)(9.8)(2.6)^2
X= 933.321 meters

Some type of thing that was invisible