WHY do launch vehicles fly exclusively in an arc?

Launch vehicles are started on an arc-shaped trajectory to get the spacecraft into orbit properly. At the first stage, the spacecraft moves upwards, overcoming air resistance, and when above 100 kilometers the atmosphere gets thin enough, the rocket changes its trajectory to reach the target orbit with minimum fuel consumption.

If the launch vehicle is lifted directly at an angle to the horizon, the air resistance will be stronger and there is no guarantee it can overcome it and reach a stable orbit.

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