If the net force equals zero, what is true?

- the object may be at rest
- the object may be in motion
- the object is not accelerating
- all of the above

the answer is b, have negligible mass

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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at right angles to each other