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?

100 meters

Answer 1

I KNOW that you must have seen this formula before. It gives
the distance covered in a certain time of accelerated motion:

D = 1/2 A T²

Distance covered= (1/2) (Acceleration) (Time squared) .

The question gives us the acceleration and the time.
I've got a weird idea: Let's plug them into the formula. OK ?

Distance = (1/2) (10 m/s²) (10 sec)²

= (5 m/s²) (100 sec²)

= 500 meters .

Deep lake !