Arock is thrown upward from the level ground in such a way that the maximum height of its flight is equal to its horizontal range r.
at what angle is the rock thrown?

The rock is thrown at an angle 76 degrees

Explanation:

The rock thrown will follow projectile motion with

Range ,

and maximum height ,

where u=initial speed of rock , g= acceleration due to gravity ,

Given

=>

=>

Thus the rock is thrown at an angle 76 degrees.

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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