Question

A bubble originating at the bottom of a lake rises to the surface within 10.0 seconds with an acceleration of 10.0 meters/second2. What is the depth of the lake?

Answer 1

The answer is 500 m.

d = u * t + 1/2 a * t²

We know:
d = ?  (distance)
u = 0 (the initial velocity)
t = 10 s (time
a = 10 m/s² (acceleration

d = u * t + 1/2 a * t²
d = 0 * 10 + 1/2 * 10 * 10²
d = 0 + 1/2 * 10 * 100
d = 500 m