If we have a velocity of 20 m/s and our acceleration is -5 m/s, then after 2 seconds our velocity will be a) 15 m/s
b) 40 m
c) 10 m/s
d) -10 m/s

v = 10 m/s

Explanation:

We have,

Our initial velocity is 20 m/s

Our acceleration,

It is required to find the velocity after 2 seconds. It is a concept based on equation of kinematics. Using first equation:

Plugging all the known values

So, our final velocity is 10 m/s.

as we know our atmosphere or air have different levels. every level has other gasses, and every gas has another permeability. when the light comes from lower permeability to higher permeability, it changes its direction. so that means that when the light comes from the moon to the earth, it changes it's direction many more times. it basically means that the shape of the light part of the moon is changed on the earth.

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