If the motion is parabolic, is the final speed calculated using both directions?

If the motion is parabolic, is the final speed calculated using both directions?

Projectiles have both a vertical and horizontal velocity. While horizontal velocity remains constant, it’s the VERTICAL velocity that is changing thus B and C are incorrect. The final speed will be the vector SUM of the horizontal and vertical velocities which is why D is correct and A is incorrect. Two find the sum of two velocity vectors you must use the Pythagorean theorem.

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