Question

an object of mass 10 kg is released from the top of a building of height of 100 m . there is a pond at the bottom of building then find the time taken to hear the sound of the splash after release plz plz don't spam if you give this answer then I become follower ​

Answer 1

A stone is dropped from the top of a tower.If it hits the ground after 10 seconds, what is the height of the tower?

The distance an object moves, starting from rest, under a constant acceleration is equal to (1/2)at^2.* Gravitational acceleration changes with height; infinitely far from Earth, the acceleration is zero. Close to the Earth’s surface, the acceleration is a constant 9.81 meters per second per second.

But for any building built so far in history, the change in acceleration between top and bottom can be taken to be entirely negligible. This means that, in the case you are asking about, we can assume a = 9.81 meters per second per second.

So, let's take that 10 seconds and solve for the height. We have:

h = (1/2) a t^2 = (1/2) (9.81) (10)^2 = 490.5 meters

The building is 490.5 meters tall!

Hope it helps you mate

Answer 2

The object released from the top of the tower is freely falling. So it is independent of mass.

We know,  s= ut +  1/2 gt²

               u = 0

               ⇒ s = 1/2 gt²

               ⇒  100 = 1/2 * 10 * t²

   Therefore, t = 2√5 s

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