For a plane to be able to fly clockwise in a horizontal circle as seen from above, in addition to exerting a force downwards on the air
a. it must be increasing its speed.
b. it must exert a force on the air that is directed to the plane's left side.
c. it must exert a force on the air that is directed to the plane's right side.
d. it does not need to exert a force: it must only move the wing flaps out.
e. it only needs to deflect the air without exerting any additional force on the air.
b
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