Answer:
it's all around you and it can't be destroyed
Hi friend
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Your answer
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★ Pitch => It is the shrillness or coarseness of the sound.
Higher frequency = Shrill sound
Lower frequency = coarse sound
So, Final answer -
A. Frequency of sound waves
HOPE IT HELPS
Answer:
Explanation:
Given
initial velocity 
At maximum height velocity of ball is zero
using

where v=final velocity
u=initial velocity
a=acceleration
s=displacement



time taken by the ball to reach the maximum height




At
height of ball is




i.e. ball is moving downward
height at 


In mechanics, the net force is the vector sum of forces acting on a particular or object