Maybe the water wasnt stable enough and probably couldnt read the water level correctly
        
                    
             
        
        
        
Answer:
37.42 m/s
Explanation:
We know that apparent frequency,  is given by
 is given by
 where f is the given frequency in this case 392, V is the speed of sound in air which is given as 343 and
 where f is the given frequency in this case 392, V is the speed of sound in air which is given as 343 and  is the speed of car which is unknown, \bar f is given as 440 Hz
 is the speed of car which is unknown, \bar f is given as 440 Hz

 
        
             
        
        
        
Answer:
h = 90.10 m
Explanation:
Given that,
A man is standing near the edge of a cliff 85 meters high, h₀ = 85 m
The initial speed of the stone, u = 10 m/s
The path followed by the projectile is given by :
 ....(1)
 ....(1)
For maximum height,
Put dh/dt = 0
So,

Put the value of t in equation (1).

So, the maximum height of the stone is equal to 90.10 m.
 
        
             
        
        
        
<span>At the exact instant the blue ball reaches maximum height, it is stationary for that millisecond in time before it begins to fall, therefore its speed is zero. (The other factors listed have no effect on the speed at the moment of maximum height.)</span>