Answer:
the last one 
Step-by-step explanation:
Answer:
The rider is 15.91 seconds 50 ft above the ground after reaching the low point
Step-by-step explanation:
We can evaluate the angle α
using trigonometry applied to the orange small triangle with height 50-30 = 20 ft and hypotenuse equal to the radius r = 25ft
Now



So 50
ft of height corresponds to the total angle:
= 2.498 radians
Now the angular velocity



To describe 2.498 rad it will take:

t = 15.91
s
The beginning has 12 seconds, the middle part has 36 and the end has 72 seconds.
Let’s separate the song into three parts and write and equation that equals to 120 seconds.
120= x + 3x + 6x
120= 10x
X=12 seconds