Question

You drop a stone from rest into a well that is 5.2m deep. How long does it take before you hear the splash?

Answer 1

Answer:

So after 1.0301 sec we hear the splash

Explanation:

We have given that height of the well h = 5.2 m

As the stone is dropped from rest so initial velocity u = 0 m/sec

Acceleration due to gravity $g=9.8m/sec^2$

We have to find the time

From second equation of motion we know that

$h=ut+\frac{1}{2}gt^2$

$5.2=0\times t+\frac{1}{2}\times 9.8\times t^2$

$t^2=1.061$

t = 1.0301 sec