Answer:

8.57181 s
84.0894561 m/s
Explanation:
t = Time taken
u = Initial velocity
v = Final velocity
s = Displacement
g = Acceleration due to gravity = 9.81 m/s² = a
Let distance from ground be x
From equation of motion we have

Here, distance covered while the stone is falling will be 

The equation is 
At the ground x = 0

The time taken by the stone to fall to the ground is 8.57181 s

The velocity of the stone when it reaches the ground is 84.0894561 m/s
Answer:
23: Acceleration 24:1m/s^2
Explanation:

If it's a mechanical wave, then its speed depends on the physical characteristics of the medium.
If it's an electromagnetic wave, then its speed depends on the
electrical characteristics of the medium.
Either way, the properties of the medium determine the wave speed.
You want to change the speed ? You have to change the properties
of the medium.