Answer:
50.2 cm
Explanation:
We have the following data:
Height, h=3.5 m
Initial horizontal velocity, 
Time, t=0.32 s
We need to determine how far the ball is from the ground after 0.32 s.
Initial vertical velocity, 

Where 



This method is termed dimensional analysis, which focuses solely on the measurement units without considering their values. You need to perform calculations using variables while eliminating similar items from both the numerator and denominator. The outcome is as follows:
F = mv²/r = [kg][m/s]²/[m] = [kg][m²⁻¹][1/s²] = [kg·m/s²].
To tackle this issue, we will apply the principles linked to the Doppler effect. This effect refers to the alteration in the perceived frequency of any wave when there is relative motion between the source of the waves and the observer. It can be mathematically explained as

In this case,
=frequency detected by the receiver
=frequency emitted by the source
=speed of the detector
=speed of the source
v=speed of sound waves
Substituting values yields,


Thus, the frequency that passengers would hear is 422Hz