A stone is thrown with an initial velocity of 20 meters per second straight upward from the edge of a cliff 100. meters above a canyon floor. The stone just misses the cliff’s edge on its way down. [Neglect friction.] Calculate the velocity of the stone 6.0 seconds after it is thrown.
Calculate the position of the stone 6.0 seconds after it is thrown.

when two balls of the different masses are dropped from equal height, they reach the ground at the same time .this is because they experience the same acceleration.

the acceleration is independent of mass.

thus when they are dropped they will always maintain the same velocity and travel the same distance (neglect air resistance of course) at the same time.

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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the ima (higher than 1m) will be greater than the ima with the height of 1m.