D because the tornado siren are supposed to be loud so everyone could hear
The wavelength of the light decreases as it enters into the medium with the greater index of refraction. The wavelength of the light remains constant as it transitions between materials.
Answer:
y₀ = 1020.3 m
Explanation:
This is a projectile launching exercise, in this case as the package is released its initial vertical velocity is zero.
y = y₀ + t - ½ g t²
when it reaches the ground its height is zero
0 = y₀ + 0 - ½ g t²
y₀ = ½ g t²
let's calculate
y₀ = ½ 9.8 14.43²
y₀ = 1020.3 m
1. The time taken for the body to fall to ground is 4 s
2. The vertical component of the velocity when the body falls to the ground is 39.2 m/s
3. The distance from the rock when it strick the ground 10m/s is 40 m
<h3>1. How to determine the time </h3>
- Height (h) = 80 m
- Horizontal velocity = 20 m/s
- Time (t) =?
h = ut
80 = 20 × t
Divide both sides by 20
t = 80 / 20
t = 4 s
Thus, it will take the body 4 s to land on the ground.
<h3>2. How to determine the vertical component of the velocity</h3>
- Time (t) = 4 s
- Acceleration due to gravity (g) = 9.8 m/s²
- Velocity (v) =?
v = gt
v = 9.8 × 4
v = 39.2 m/s
<h3>3. How to deteremine the distance</h3>
- Horizontal velocity = 10 m/s
- Time (t) = 4 s
- Horizontal distance (s) =?
s = ut
s = 10 × 4
s = 40 m
Learn more about motion under gravity:
brainly.com/question/20385439
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