In which of the following cases the body:
(1) is static.
(2) moves with uniform velocity

A, is static because F1 and F2 are moving in opposite directions and are equal to each other, the forces cancel out making the system static.

C,Moves with uniform velocity because while F3 is pulling the system down and F1 pulling the system up at an angle, the combined force of F3 and F2 balance the force exerted by F1 (assuming the system in on a flat surface)(not 100% sure in this one)

Hope this helps in anyway..

as we probably am aware that our atmosphere or air have various levels, each level has different gasses, and each gas has another porousness. at the point when the light originates from lower porousness to higher penetrability, it alters its course. with the goal that implies that when the light originates from the moon to the earth, it alters it's course a lot more occasions. it essentially implies that the state of the light piece of the moon is changed on the earth.

not copied too! hope this !

joke:

h o h o hope you have a merry christmas!