question archive In the absence of air resistance there are no forces or components of forces that act horizontally
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In the absence of air resistance there are no forces or components of forces that act horizontally.
A velocity vector can only change if there is (acceleration is the rate of change of velocity). In order to accelerate a resultant force is required (according to , ##vecF=mveca##).
In the absence of air resistance the only force acting on a projectile in flight is the weight of the object. Weight by definition acts vertically downwards, hence no horizontal component.