Question

Explain this don't write unnecessary things otherwise you will be reported​

Answer 1

Answer:

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 (acceleration is the rate of change of velocity). In order to accelerate a resultant force is required (according to Newton's Second Law,  

F=ma)

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.

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