Answer:
in this video waves are coming up for the BOTTOM to the top of the sandbar
Explanation:
It is given that,
Mass of person, m = 70 kg
Radius of merry go round, r = 2.9 m
The moment of inertia, 
Initial angular velocity of the platform, 
Part A,
Let
is the angular velocity when the person reaches the edge. We need to find it. It can be calculated using the conservation of angular momentum as :

Here, 


Solving the above equation, we get the value as :

Part B,
The initial rotational kinetic energy is given by :



The final rotational kinetic energy is given by :



Hence, this is the required solution.
The answer is D. As the ambulance gets closer, the sound waves are compressed relative to the person; so the frequency increases.
I’m pretty sure you times them so 1 with A, 2 with e, 3 with C, and 4 with B