A tennis ball with a mass of 0.1kg falls off the roof of a building 10.4 meters tall. How long does it take for the ball to hit the ground ?

1.46 seconds

Explanation:

The key formula ==>            H = 1/2 G T²

                                        10.4 = 1/2 (9.8) T²

Divide each side by  4.9 :  T² = 10.4 / 4.9

                                          T = √ (10.4/4.9) = 1.46 seconds .

The mass of the ball doesn't make any difference.  If not for air resistance,

a feather and a school bus, dropped from the same height at the same time,

would fall together, and hit the ground at the same time.  We've known this

for roughly 600 years now, and I suspect you learned it in the same high

school class where your question came from.

ok

explanation:

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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