Answer:
the child have to exert this much amount of force radially to stay on the wheel.
Explanation:
Given:
mass of the child, 
radius of the merry-go round wheel, 
moment of inertia of the wheel, 
angular velocity of the wheel, 
Since the child is sitting on the edge of the rotating wheel the child will feel and outward throwing force called centrifugal force.
Centrifugal force is mathematically given as:


the child have to exert this much amount of force radially to stay on the wheel.
Sedimentary was the right one
Light speed is the speed at which light can travel in a "vacuum" (space for example).
The speed of light is constant and is exactly: 299,792,458 meters per second
ONLY IN A VACUUM!!
The speed of light changes when it goes through different mediums (such as from space to Earth, light travels slower in Earth).
Good luck!
Answer:
4 seconds
Explanation:
Given:
v₀ = 0 m/s
v = 20 m/s
a = 5 m/s²
Find: t
v = at + v₀
20 m/s = (5 m/s²) t + 0 m/s
t = 4 s