Answer:
I don't even know can anybody help this person
1 is standing wave
2 is Constructive Interference
<span>3 is longitudinal
4 is first choice
5 is first choice</span>
Answer:
Football will be in air for 2.8139 sec
Explanation:
We have given maximum height h = 9.7 meters
Angle of projection 
We know that maximum height is given by 
So 

u = 22.396 m/sec
Time of flight is given by
