Answer:
vf=19.6
h=19.6
FROM FIRST EQUATION that is vf=vi+gt
then vf = 0+9.8*2=19.6m/s
FROM SECOND EQUATION that is H=vi*t+1/2gt²
then H=0*2+1/2*9.8*2²=19.6
Answer:
Can the wave travel between the Sun and Earth?
Can the wave travel between a gas and a liquid?
Answer:
It will take 30 seconds to reach the ground, and it will be travelling at 294 m/s when it does so. This means that its average velocity was 147 m/s.
Explanation:

Since the initial velocity of a dropped object is 0, we can make this the equation:


The final velocity can be calculated with the formula:

Once again, since there is no initial velocity:

Since the initial velocity is 0, the average vertical velocity is 294/2=147 m/s.
Hope this helps!
To solve this problem it is necessary to take into account the concepts of Intensity as a function of Power and the definition of magnetic field.
The intensity depending on the power is defined as

Where
P = Power
r = Radius
Replacing the values that we have,


The definition of intensity tells us that,

Where,
Magnetic field
Permeability constant
c = Speed velocity
Then replacing with our values we have,

Re-arrange to find the magnetic Field B_0

Therefore the amplitude of the magnetic field of this light is
the answer is true acceleration is the change in distance over time.
hope this helps